238 results found.
... Science Frontiers ONLINE No. 33: May-Jun 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Horsing Around With Evolution In the Borrego Badlands of California, Barbara Quinan has stumbled upon the fossilized skull of a modern horse, E. equus. The skull was found in situ, partly mineralized, a process usually requiring hundreds of thousands of years. Mammoth bones punctuate the strata immediately above and below those containing the horse fossil. The paleontological anomaly is that modern horses were supposed to have evolved in Asia and not brought to the New World until the Spanish explorers landed. The only way to evade rewriting horse history is to: (1 ) Cast doubt on the dating of the strata, or (2 ) Insist that the fossil is not really a horse at all but a similar animal, such as the long-headed zebra. (Smith, Gordon; "E . Equus: Immigrant or Emigrant?" Science 84, 5:76, April 1984.) From Science Frontiers #33, MAY-JUN 1984 . 1984-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 26: Mar-Apr 1983 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Prescient Evolution Lately, a fossil moth egg was found in 75-million-year-old sediments in Massachusetts. The egg is positively assigned to the moth family Noctuidae and extends the fossil record of this family back into the Cretaceous. So what? Well, it turns out that Noctuidae family moths have special organs for detecting the ultrasonic cries of insect-hunting bats. The fossil record of the bats, however, only goes back to the early Eocene, perhaps 20 million years after the Noctuidae moths. Since no other insect predators like bats existed, it would seem that the moths developed these special organs in anticipation of the bats! (Gall, Lawrence F., and Tiffney, Bruce H.; "A Fossil Noctuid Moth Egg from the Late Cretaceous of Eastern North America," Science, 219:507, 1983.) Comment. Do humans have talents that seem unimportant now but which may be useful some day? Calculating prodigies, eidetic imagers, etc. From Science Frontiers #26, MAR-APR 1983 . 1983-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 32: Mar-Apr 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects An Even Larger Ocean Of Life Fred Hoyle has written another book, The Intelligent Universe; A New View of Creation and Evolution. The subject matter is irresistible and, to make things more interesting, New Scientist has published a scathing review of it, castigating Hoyle for his doubts about evolution and terming his approach "dispicable." (My! How conventional people hate unconventional people!) In this new book, Hoyle goes far beyond his previous thesis, which in essence declared that from statistical considerations life could not have arisen and evolved on earth. Rather, life had to come from outer space, probably in the form of bacteria and viruses. Evolution was and is dependent upon new information arriving from outer space on tiny bits of life. Hoyle now greatly extends his theory: "But where did a knowledge of amino acid chains of enzymes come from? To use a geological analogy, the knowledge came from the cosmological equivalent of a previous era, from a previously existing creature if you like, a creature that was not carbon-based, one that was permitted by an environment that existed long ago. So information is handed on in a Universe where the lower symmetries of physics -- and characteristics of particles and atoms -- are slowly changing, forcing the manner of storage of the information to change also in such a way as to match the physics. It is this process that is responsible for our present ...
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... Science Frontiers ONLINE No. 37: Jan-Feb 1985 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects What does it all mean?W.G . Pollard, a distinguished physicist, has written a very philosophical, almost mystical article on the nature of the cosmos. Let us begin with his abstract: "There are several hints in physics of a domain of external reality transcendent to three-dimensional space and time. This paper calls attention to several of these intimations of a real world beyond the natural order. Examples are the complex state functions in configuration space of quantum mechanics, the singularity at the birth of the universe, the anthropic principle, the role of chance in evolution, and the unaccountable fruit fulness of mathematics for physics. None of these examples touch on the existence or activity of God, but they do suggest that external reality may be much richer than the natural world which it is the task of physics to describe." Pollard then elaborates: Example 1. Quantum mechanics, a mathematical formulation of reality, has been extraordinarily successful in describing and predicting many things in the microscopic world. Pollard notes that quantum mechanics contains no hint of God per se and possesses no numinous quality, but its great complexity and multidimensionality provide evidence for "the reality of the transcendent order in which the natural universe is embedded." Example 2. The singularity at the beginning of the universe. Science is at a loss to explain creation and what happened before. (Pollard assumes that creation occurred like most scientists.) ...
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... Science Frontiers ONLINE No. 35: Sep-Oct 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Getting The Pouch Right When we think of kangaroos hopping about Australia (which isn't very often), we know that all baby kangaroos are safely "buckled in" their mothers' pouches -- nature's own vehicle restraint system. How fortunate it is that kangaroo pouches open at the top; otherwise, little kangaroos would be falling out all over the place. While some marsupials have pouches opening "up" or "forward" in quite a few others evolution got the directions for pouch manufacture reversed. The koala, the wombat, the thylacine, and the marsupial mole all have backward-opening pouches. Obviously, a forward-opening pouch on the mole would act like a dirt scoop, to the great inconvenience of any occupants. On the other quadrupeds, the backwardopening pouch may protect the young from branches and vegetation. (Marshall, Jeremy H.; "Directional Pouches," Nature, 309:300, 1984.) Comment. This is an example of the socalled Problem of Perfection, where life seems marvelously attuned to its environment; that is, "fittest." Somewhere among the millions of species alive today, there must be one out-and-out failure. Of course, if full-scale nuclear war breaks out, we will know that evolution did make at least one mistake! Evolution gone wrong! Nature's cartoon of a kangaroo with a wrong-way ...
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... Science Frontiers ONLINE No. 35: Sep-Oct 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Mind Before Life For some years S.W . Fox, at the Institute for Molecular and Cellular Evolution, University of Miami, has been experimenting with possible precursors of life. So-called "microspheres" are hot items in Coral Gables these days. Fox and his colleagues make microspheres by preparing a heated stew of various amino acids. These amino acids form long polymer chains spontaneously. Then, when water is added and the mixture reheated (or processed in some other way), the polymers organize themselves, again spontaneously, into spheres a few microns in diameter. Each sphere consists of a two-layer membrane with residual material trapped inside. Although thicker, the microsphere membrane is very similar to the lipid bi-layer enclosing normal living cells. The relatively stable microspheres could, in theory, have formed sheltered environments for the evolution of the more complicated parts of living cells. The microspheres absorb sunlight and, with the addition of this energy, display some of the electrical characteristics of biological neurons, like those in the brain. The implication is that some components of "mind" may have existed in the very earliest life forms. (Peterson, Ivars; "Microsphere Excitement," Science News, 125:408, 1984.) Comment. Two comments here: First, the word "spontaneous" is customarily employed when describing how atoms unite to form molecules and molecules combine into polymers, which then gather ...
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... Science Frontiers ONLINE No. 37: Jan-Feb 1985 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Recent Pulsations Of Life At a recent meeting of scientists at the Lamont-Doherty Geological Observatory, E. Vrba, of the Transvaal Museum, in Pretoria, stated: "If we eventually are able to establish a good time resolution with the continental record, I expect to be able to discern synchronous pulses of evolution that involve many groups of fauna and flora. Many different lineages in the biota will respond by synchronous waves of speciation and extinction to global temperature extremes and attendant environmental changes. This is my starting hypothesis." Vrba was speaking mainly about the last 25 million years, a mere flash in geological time. For this brief period, the Deep Sea Drilling Program has provided geologists with a detailed and continuous record of climate changes as they were recorded in deep-sea sediments. By contrast, the faunal history of the continents is rather fragmentary, making it rather difficult to match up pulsations of climate with pulsations of life. Even so, scientists have found rather strong correlations between climatary change and biological speciation and extinction at 15, 5, and 2.4 million years ago. (Lewin, Roger; "The Paleoclimatic Magic Numbers Game," Science, 226:154, 1984.) Comment. Note that this is just the period our ancestors seemed to be evolving rapidly. Also interesting is the general agreement between Vrba's statement about the driving forces behind evolution and McClintock's conclusion quoted earlier ...
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... lungs, folded intestines, etc., along with the forced circulation of air, blood, and other sub stances. This latter approach survived, while the two-dimensional Ediacaran Experiment did not. The demise or extintcion of the Ediacarans led Gould, the author of this far-ranging article, to the influence of extinctions on life in general -- a hot topic these days. Gould stated that with natural selection operating, one would expect continual "improvement" in life forms, but that this had not happened. "I regard the failure to find a clear 'vector of progress' in life's history as the most puzzling fact of the fossil record. But I also believe that we are now on the verge of a solution, thanks to a better understanding of evolution in both normal and catastrophic times. We need a twotiered explanation for patterns (or non-patterns) in the history of life." The first tier of explanation involves the theory of punctuated equilibrium, as championed by Gould and Eldredge. Gould says he once thought that punctuated evolution would be sufficient to explain all of life's development, but that now a second tier seemed required; namely, a general theory of mass extinction or what catastrophism does to life and its development. (Gould, Stephen Jay; "The Ediacaran Experiment," Natural History, 93:14, February 1984.) Ediacaran life forms were typically flattish to maximize external area. From Science Frontiers #33, MAY-JUN 1984 . 1984-2000 William R. Corliss ...
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... synapomorphies) should be used. For example, the character 'possession of feathers' is a synapomorphy shared by all birds that is found in no other organisms; it is used in classification to define Class Aves. All birds have a backbone too, but that is a primitive character for birds because it is seen in all other vertebrates. Primitive characters are of no use in defining a monophyletic group." Early on, cladism ignited many fireworks in the biological community. Today, cladism has become quite respectable. The cladists, however, are now fighting among themselves. One camp draws their "cladograms" (see illustration) using evolutionary theory as a guide. The other side believes that the cladograms should be drawn up first, based only upon actual characters and ignoring the theory of evolution -- let the species fall where they may. When evolutonary theory is omitted in the deliberations, radically different cladograms result. Mammals then seem more closely related to birds than reptiles, for example, as expressed in the illustration. A key connecting character here is mutual warmbloodedness. The shifting of a few lines in a cladogram may seem trivial to the nonbiologist, but saying that man is more closely related to a chicken than a lizard is pretty controversial stuff to the conservative evolutionist. DNA analysis supports the contention that humans are more closely related to birds than reptiles. Paleontological evidence, however, supports the opposite view. The fight rages on. (Benton, Mike; "Is a Dog More Like a Lizard or a Chicken?" New Scientist, p. 18, August ...
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... catastrophism is now coming into its own. First, there was the admission that a few small craters, like Meteor Crater in Arizona, just might be of meteoric origin; then, more and bigger craters (astroblemes) were recognized; and, recently, the discovery of the iridium-rich layer at the Cretaceious-Tertiary boundary has made the subject very popular, as evidenced by the following three items: A long, very thorough and scientific review of geological and biological changes caused by meteor strikes throughout the earth's history. (McLaren, Digby J.; "Bolides and Biostratigraphy," Geological Society of America, Bulletin, 94:313, 1983.) A shorter, popular version of the above. (McLaren, Digby; "Impacts That Changed the Course of Evolution," New Scientist, 100:588, 1983.) Evidence is growing that the collision of planetary material with the Earth can profoundly affect local geology, and that impacts of very large meteorites may have influenced the evolution of the Earth and the life that exists upon it. This quotation is from the lead-in to the article references below, which also has a nice world map of major impact sites over 1 km in diameter. (Grieve, Richard; "Impact Craters Shape Planet Surfaces," New Scientist, 100:516, 1983.) Reference. Terrestrial cratering phenomena are cataloged in Chapter ETC in Carolina Bays, Mima Mounds. For details about this book, go to: here . From Science Frontiers #31, JAN-FEB 1984 . 1984-2000 ...
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... of all the pieces on a chessboard after a quick glance. But if the chessmen are arranged randomly and meaninglessly, his memory is reduced to near-normal. The gist is that long prac-tice and the application of mnemonic devices can vastly improve anyone's memory and, in consequence, memory prodigies are not really so anomalous. (Ericsson, K. Anders, and Chase, William G.; "Exceptional Memory," American Scientist, 70:607, 1982.) Comment. The real anomaly here may be the fact that the human memory and related memory faculties seem orders of magnitude better than needed for survival. How did such capabilities evolve? Of what use is a prodigious memory to an Ice Age man facing a cave bear? Are we dealing with prescient evolution, like the moth described above, holding capabilities in reserve until they are really needed. From Science Frontiers #26, MAR-APR 1983 . 1983-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 31: Jan-Feb 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The hypothesis of formative causation lives!Rupert Sheldrake's hypothesis has been roundly condemned by many scientists, presumably because it departs so radically from current thinking. Basically, the hypothesis maintains that the forms of things (from crystals to life forms) and the behavior of organisms is influenced by "morphic resonance emanating from past events." Convergent evolution, wherein human eyes closely resemble squid eyes, might well be explained by the hypothesis. Sheldrake has been testing his idea in various ways. One experiment involves the accompanying illustration containing a hidden image. Once the solution of this illustration is learned, it is hard to forget, but few people see the answer right off. The hypothesis of formative causation insists that once one or more persons learn the drawing's secret, the easier it will be for others to see the solution. Actual tests consisted of broadcasting the illustration and its solution (that is, the hidden image) on English television combined with before-and-after checks elsewhere in the world outside TV range. The results strongly supported the hypothesis, for it was far easier for people outside England to identify the hidden images after the broadcast. (Sheldrake, Rupert; "Formative Causation: The Hypothesis Supported," New Scientist, 100:279, 1983.) Comment. With all this prior publicity, the hidden image should pop immediately into the reader's mind. But if it doesn' ...
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... (Lynch, Wayne; "Great Balls of Snakes," Natural History, 92:65, April 1983.) Comment. Evolutionists tend to "explain" facts in a circular fashion; that is, only the most efficient reproducers (or "fittest") survive, therefore those that survive must be the best reproducers. While the garter snake strategy has some advantages in terms of getting male and female together, things may have gone too far. For example, one communal den was flooded, killing 10,000 snakes. Predators have a field day when emergence occurs. One would think that dispersed hibernating snakes, with 1:1 male-to-female ratio, might prove to be an even better strategy. The point here is that blind application of the theory of evolution may mask other natural strategies. Survival of the fittest (or the most efficient reproducers) may not be the Master Plan. From Science Frontiers #27, MAY-JUN 1983 . 1983-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 34: Jul-Aug 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects A Note On Perfect Pitch An individual with perfect pitch can identify a tone without hearing a second tone for comparison. It is difficult to avoid the conclusion that such individuals possess a set of frequency standards somewhere in their permanent memories. The less fortunate of us do not have the genes that lead to the construction of these cerebral frequency standards. (Anonymous; "A Note on Perfect Pitch," Scientific American, 250:82, June 1984.) Comment. Question 1. Does perfect pitch have any survival value that would stimulate its evolution? Question 2. How are these frequency standards coded on the genes? From Science Frontiers #34, JUL-AUG 1984 . 1984-2000 William R. Corliss ...
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... latitudes. Latest Cretaceous plant fossils in the Arctic predate mid-latitude occurrences by as much as 18 million years, while typical Eocene vertebrate fossils appear some 2 to 4 million years early." (Hickey, Leo J., et al; "Arctic Terrestrial Biota: Paleomagnetic Evidence of Age Disparity with Mid-Northern Latitudes During the Late Cretaceous and Early Tertiary," Science, 221:1153, 1983.) Comment. The anomaly here is in the vision of the high Arctic lands basking in the warm sun busily evolving new life forms well in advance of their appearance in lands closer to the Equator. What happened to the earth's axial tilt. These fecund polar territories should have been engulfed in darkness almost half of the year -- hardly an environment for precocious plant evolution. Further, trees found buried in the Arc-tic muck could never have grown where found due to the long polar darkness. From Science Frontiers #30, NOV-DEC 1983 . 1983-2000 William R. Corliss ...
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... mouse eggs with human beta-globin gene sequences. One of the resulting adult mice carried the human gene sequence intact; one of the others carried at least part of the sequence. More significantly, the latter mouse transmitted the human gene sequence to its progeny in a Mendelian ratio. (Stewart, Timothy A., et al; "Human Beta-Globin Gene Sequences Injected into Mouse Eggs, Retained in Adults, and Transmitted to Progeny," Science, 217:1046, 1982.) Comment. Animal cells are therefore not too fastidious about what they manufacture and what is transmitted to progeny. The unanswered questions are: How far can this proxy replication and transmission of genes go; and, most important, can it occur in nature to a degree sufficient to contribute to the evolution of new species? From Science Frontiers #24, NOV-DEC 1982 . 1982-2000 William R. Corliss ...
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... and spectacular gold artifacts. It was obviously a highly advanced culture, technologically and socially. But it was dated at 400-800 AD; and for this period in South American history these accomplishments did not seem out of line. Recently, though, additional evidence of this civilization was discovered beneath a datable volcanic ash. The new dates for this civilization are 600-1 ,500 BC, putting it about 1,000 years ahead of Maya and Inca achievements. The "digs" show further that this culture was frequently beset by devastating outbursts of volcanic activity, which often rendered large areas of land uninhabitable. Rather than suppressing this remarkable culture, Donald Lathrap, a University of Illinois archeologist, says: "Those disasters pushed people from the region and led to upward leaps in social evolution..." (Anonymous; "Key to a Vanished Empire," San Francisco Chronicle, June 14, 1984. Cr. J. Covey.) Comment. The reaction of this early society of advanced organisms to environmental stress seems a perfect introduction to several items that follow on how cells and other species respond to stresses from without. From Science Frontiers #37, JAN-FEB 1985 . 1985-2000 William R. Corliss ...
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... to reprogram itself and construct a wholly new and unplanned plant structure to house and feed the developing insect. Some of these structures (galls) are very elaborate and are precisely tailored to each different wasp species. From such examples, it is apparent that the genome of an organism somehow perceives stresses and reacts to them -- often in completely unanticipated ways. The stresses may be mechanical, thermal, chemical; in fact, almost anything. McClintock's conclusion is: ". .. that stress, and the genome's reaction to it may underlie many formations of new species." (McClintock, Barbara; "The Significance of Responses of the Genome to Challenge," Science, 226:792, 1984.) Comment. The implications here are broad and deep. Evolution can be driven by external stresses. The new species thus produced may differ substantially from the original organism, eliminating the need to look for "missing links" in the fossil record. What "hope-ful monsters" are latent in our human genome, awaiting only the right stresses to manifest themselves? And is the genomes's malleability reversible; that is, can extinct species be recovered when the engendering stresses are removed? From Science Frontiers #37, JAN-FEB 1985 . 1985-2000 William R. Corliss ...
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... animals: earlier and earlier Two biologists looking for plant fossils in the Catskills found instead the remains of ancient centipedes, mites, and spider-like creatures -- a classical case of serendipity. These animals were in a Devonian formation dated at 380 million years. It turned out that they were the oldest fossils ever found of purely land animals. (Some fossil animals of about the same age are known in European rocks, but in semiaquatic environments.) Two aspects of the fossils are of special interest: The animals found were already well-adapted to terrestrial life, inferring that the (assumed) invasion of the land from the sea has to be pushed back much farther in time; and Many of the fossil animals are essentially identical to modern forms, suggesting that little if any evolution has occurred in 380 million years. (Anonymous; "Fossils found in N.Y . Alter Scientists' View," Baltimore Sun, May 29, 1983. Comment. Note the sudden jump from no land animals to well-developed, frozen-in-time land animals. From Science Frontiers #28, JUL-AUG 1983 . 1983-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 34: Jul-Aug 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Sunspots And Disease Six of the major influenza epidemics, at least as far back as 1917, were synchronized with the sunspot cycle. Fur-thermore, all but one of these epidemics involved an antigenic shift, wherein the flu virus developed a new coat of protein, which made it resistant to the immunities the population had built up over the years. There is no known mechanism by which solar activity can abet virus evolution, except penetrating radiation, which is inherently destructive. Lowered human immunity may also be a consequence of solar activity, according to Solco W. Tromp, director of the Biometeorological Research Center in the Netherlands. Over 30 years of research, using blood data from 730,000 male donors, led Tromp to the conclusion that the blood sedimentation rate varies with the sunspot cycle. Since this rate parallels the amount of albumin and gamma globulin, resistance to infection may also follow the lead of the sun. (Freitas, Robert A., Jr.; "Sunspots and Disease," Omni, 6:40, May 1984.) From Science Frontiers #34, JUL-AUG 1984 . 1984-2000 William R. Corliss ...
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... of the other types of diseases mentioned as possible consequences of virus infection are those involving the faulty manufacture of insulin, neurotransmitters, hormones, and immune system regulators. (Miller, J.A .; "Subtle is the Virus: Cells Stay Intact," Science News, 125: 70, 1984.) Comment. This item dwells on the negative aspects of vial infections. Indeed, we automatically assume every infection by any virus or bacterium to be bad for the organism. This may not be so. Now that we have discovered that viruses can cause bodily changes without damaging the cells of the infected organism, we should ask whether favorable physical changes might not be caused by viruses, but not recognized as such. Going a few steps further: Is intelligence a disease? Could evolution be accelerated or directed through the mediation of viruses? See below for more on this. From Science Frontiers #32, MAR-APR 1984 . 1984-2000 William R. Corliss ...
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... analogy. If nature is shuffling the cards of the universe, why are so many royal flushes being dealt? They introduce the works of Ilya Prigogine and others which focus on chemical situations (the Belousov-Zhabotinsky reactions), where reaction by-products actually make the reaction more likely and in which large, stable spiral and ring-shaped structures appear spontaneously. At the macroscopic level, shock waves from supernovas can (at least in computer models) stimulate the formation of spiral arms in galaxies. The article concludes with a quote from astronomer David Layzer: "The universe is unfolding in time but not unraveling; on the contrary, it is becoming constantly more complex and richer in formation." (Tucker, Wallace, and Tucker, Karen; "Against All Odds: Matter and Evolution in the Universe," Astronomy, September 1984.) Comment. Now Layzer's statement seems a clear denial of the Second Law. It says, rather, that there is something intrinsic in the universe that creates order (spiral galaxies, amino acids, humans). We don't explain this tendency (assuming it really exists) just by identifying Belousov-Zhabotinsky reactions and saying, "That's the way things are." We can go one step further and say that the fundamental particles of physics have just the right properties so that they fall together into atoms, molecules, galaxies, and life forms. Can science go any further? From Science Frontiers #36, NOV-DEC 1984 . 1984-2000 William R. Corliss ...
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... been followed on a cell-bycell basis from egg to adult. The history of each cell is known from birth to death. The fact that C.elegans is nicely transparent helps the cell-watcher. Here are some of the interesting things to be seen as cells proliferate, live, and die. First, C. elegans is bilaterally symmetrical, but the pattern of cell generation on the right differs from that on the left. Nevertheless, the creature ends up symmetrical, making one wonder where the directions for symmetry come from. Some cells are transients, dying when their jobs are done. A few doomed cells are generated only because they produce sister cells that are needed in the final animal. Such a programmed loss of cells may be a method of modifying an organism during evolution. John Sulston, one of the researchers, says, "Within the lineage you can see the fossil of its past." (Marx, Jean L.; "Caenorhabditis Elegans: Getting to Know You," Science, 225:40, 1984.) Comment. Sulston's statement reminds one of "Ontogeny recapitulates phylogeny," which we thought had been discredited long ago. From Science Frontiers #35, SEP-OCT 1984 . 1984-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 26: Mar-Apr 1983 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Gyroscopic Galaxies The popular conception of a galaxy draws it in pancake shape, with a spiral structure consisting of many millions of stars. Oddities and deviants exist, but hardly anything as bizarre as a handful of recently discovered ringed spirals. Although the spiral sections of the ringed spirals seem normal enough, the rings are perpendicular to the plane of the spiral -- an inclination hardly countenanced by theories of galactic evolution. The ringed spirals look superficially like toy gyroscopes. One suggestion is that two galaxies collided at an angle, but there is no evidence of such a cataclysm. Ringed galaxies are eminently anomalous. (Anonymous; "Ringed Galaxy Clue to Cosmic Riddle," Science Digest, 91:22, February 1983.) From Science Frontiers #26, MAR-APR 1983 . 1983-2000 William R. Corliss ...
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... Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Lizardless Thrashing Tails It is common knowledge that many lizards lose their tails when attacked by a predator. In some lizard species, the released tail is a live thing, thrashing violently, and deluding the predator into thinking he has caught the real animal. Predators, even if not completely fooled by the struggling tail, are diverted into subduing it, giving the lizard time to escape. The detached tails contain their own autonomous nervous system and energy supply. (Dial, Benjamin E., and Fitzpatrick, Lloyd C.; "Lizard Tail Autonomy,..." Science, 219:391, 1983.) Comment. Once again we have a biological system requiring several simultaneous evolutionary developments to be successful. Such complex biological evolution in response to predator-prey feedback is indeed marvelous. From Science Frontiers #26, MAR-APR 1983 . 1983-2000 William R. Corliss ...
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... how a very tiny and obscure brick in the Temple of Science, long thought to be structurally sound, might lead to widespread collapse. Are there other sleepers? A group of burrowing lizards (the amphisbaenians) possess a heavy bone in their heads that helps them ram their ways through the soil. In surface-living lizards this structure is merely a soft, flimsy cartilage. It was long assumed that the bone in the burrowing lizard developed from the cartilage of its surface-living kin. But a study of embryos now shows that the head bone of the burrowing lizard actually developed from a membrane instead of cartilage. The two similarly located structures are not homologous after all. They had different origins. Superficially this doesn't seem very anomalous and especially not very exciting. But vertebrate evolution in particular has been charted on the basis of homologous structures. If these structures have different biological origins -- even in just some cases -- the evolutionary family trees may be drawn wrong. (Anonymous; "Lizard Bone Shakes World of Taxonomy," New Scientist, 98:221, 1983.) Comment. No one yet knows how serious this problem really is. Basically it means that some animals that look alike (at least bonewise) need not be closely related. To use an analogy, if nature has the plans for a house stored in genetic material, it may be able to build that house out of wood, brick, or what ever material is available. From Science Frontiers #28, JUL-AUG 1983 . 1983-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 11: Summer 1980 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Hierarchies Of Evolution All organisms from man to mouse to amoeba are merely DNA's way of manufacturing still more DNA -- so goes the modern ramification of molecular biology and the Genetic Code. In other words, DNA and genes are selfish, and ultimate parasites, directing the evolution of life only to maximize the production of DNA. This theme is not the subject of this paper by Doolittle and Sapienza. Rather, they wonder about those nonsense DNA sequences that do not code for protein. The presence of these "useless" bits of genetic material is often explained in terms of gene "expression." Emphasis is always on maximizing the "fitness" of the organism (phenotype). Perhaps this seemingly excess genetic material actually maximizes the fitness (survivability) of the DNA itself. Evolution thus occurs at DNA and gene (genome) levels, despite what transpires at the organism (phenotype) level. (Doolittle, W. Ford, and Sapienza, Carmen; "Selfish Genes, the Phenotype Paradigm and Genome Evolution," Nature, 284:601, 1980.) Comment. We know that mitochondria and chloroplasts have their own genetic material; evolution may be occurring at this level, too, independent of pressures for change on the organisms. Waxing speculative, may there not be other hierarchies where systems are trying to maximize their own survivability, even at molecular, atomic, and subatomic levels? Don't laugh! ...
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... Science Frontiers ONLINE No. 8: Fall 1979 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Convergent evolution or chance look-alikes Why should caddis fly larvae and a species of aquatic snail look alike? Mimicry is rather common in nature for it often confers some sort of advantage to one or both of the species in the turmoil of evolutionary pressures. Or so the theory goes. Most examples of convergent evolution involve closely related species. In the present case, though, the species are in different phyla. The caddis fly larva builds its snail-like shell by cementing grains of sand together with a silk-like secretion, while the snail's shell is a calcareous excretion. One would expect a strong advantage to be conferred on one or the other species, especially in the matter of predation. Using brook trout as predators, how ever, proved perplexing, for the trout would eat only the snails, avoiding the carbon-copy larvae. (Berger, Joel, and Kaster, Jerry; "Convergent Evolution between Phyla...." Evolution, 33:511, 1979.) Comment. This is a remarkable case of mimicry. One wonders how the caddisfly larvae know exactly what snails look like, and how the unique shell constructing methods were coded into its genes by evolution. Or did the snail emulate the larvae? From Science Frontiers #8 , Fall 1979 . 1979-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 19: Jan-Feb 1982 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects African Fossil Sequences Support Punctuated Evolution East of Lake Turkana, in northern Kenya, the geologist finds exceptionally fine sequences of fossil molluscs in old lake deposits. Williamson has scrutinized the distribution of some 190 faunas with high stratigraphic resolution; that is, he believes he has been able to sketch for the first evolutionary events on a fine time scale. Williamson underlines three important observations: (1 ) Species seemed to arise suddenly, as predicted by the "punctuated evolution" model; (2 ) The formation of new species was accompanied by marked developmental instability in the transitional forms; and (3 ) All lineages were morphologically stable for long periods -- they did not change form! The biological implications of this important study are summarized in the preceding item. (Williamson, P.G .; "Palaeontological Documentation in Cenozoic Molluscs from Turkana Basin," Nature, 293:437, 1981.) Comment. Evolutionists have often bewailed the obvious lack of transitional forms (missing links) in the stratigraphic record. According to Williamson's results, transitional forms would be few in number and display considerable morphological instability. In essence, this means that missing links may not exist in a practical sense. If this is true, one wonders whether those famous evolutionary family trees in all the textbooks, such as that of the horse, are really misleading. From Science Frontiers #19, JAN-FEB 1982 . 1982-2000 ...
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... Science Frontiers ONLINE No. 19: Jan-Feb 1982 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Species Stability Is A Real Problem The reader should refer to the following item for the basic paleontological facts discussed by Williamson. The biological implications of the mollusc lineages drawn up by Willianson are rather profound. In the present item, Williamson complains that scientists and critics have focussed primarily upon his claim that his mollusc lineages support the punctuated evolution model (which they do) but avoid his main point: namely, that the lineages are static over very long periods of time. They do not change slowly, bit by morphological bit, into new species as an evolutionist would expect. Instead, they remain un-changed until they become extinct. This striking aspect of the fossil record is not predicted by neo-Darwinism -- and there is the rub! (Williamson, Peter G.; "Morphological Stasis and Developmental Constraint: Real Problems for Neo-Darwinism," Nature, 294:214, 1981.) Comment. In neo-Darwinism, evolution unfolds by small accumulated changes, the causes of which may be chemicals in the environment, nuclear radiation, and other "stresses." Neo-Darwinism goes hand-in-hand with geological Uniformitarianism, both of which are favored philosophically by scientists because slow change is more amenable to scientific explanation. The large sidewise steps of punctuated evolution are difficult to explain in terms of known "forces." In this context, the radical concepts of directed panspermia and the impact ...
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... Science Frontiers ONLINE No. 13: Winter 1981 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Propagation Of Acquired Characteristics Almost all biologists reject Lamarck's idea that characteristics acquired by a parent can be transmitted to the progeny. In the field of immunology, especially, experimental findings are stimulating a revival of forbidden Lamarckism! Taylor reviews several experiments in which acquired immunity seems to be passed along from generation to generation. This, of course, directly contradicts the Dogma of Evolution and Weissmann's closely related doctrine of the inviolatability of the germ plasm. But Taylor goes on to suggest several ways to circumvent Weissmann's doctrine, the most interesting of which employs viruses to carry acquired genetic information from generation to generation. (Taylor, R.B .; "Lamarckism Revival in Immunology," Nature, 286:837, 1980.) Comment. The possible role of viruses and other "disease carriers" in the unfolding (rather than "evolution") of life is only now being widely recognized. Could it be that the price of evolution and/or the responsiveness of life to environmental pressures is a certain level of infection? From Science Frontiers #13, Winter 1981 . 1981-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 16: Summer 1981 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Why are there no slave ant rebellions?Some ant species regularly raid the nests of other ants and carry some of them off into slavery. An oft-discussed question is: Why don't the slaves rebel or at least try to escape back to their home nest? There seems to be no evolutionary advantage in remaining in passive slavery promoting the fortunes of the slave-makers. The opportunities to run off and rebel are never taken. It would seem that slave-ant passivity is a marked disadvantage that has slipped through evolution's net. Regardless of the reason, an imbalance exists. (Gladstone, Douglas E.; "Why There Are No Ant Slave Rebellions," American Naturalist, 117:779, 1981.) Comment. Perhaps evolution just hasn't had time to redress the situation and even now is preparing clever mutations to rescue the slave ants; i.e ., improve their fitness. From Science Frontiers #16, Summer 1981 . 1981-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 20: Mar-Apr 1982 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Something hot beneath small saturn-satellite surfaces Crater-density studies of the small, icy Saturn satellites Rhea, Dione, Mimas, and Tethys reveal important non-uniformities in crater distribution and age. The anomalies are so large that astronomers have concluded that these objects must have undergone considerable evolution after they were formed by accretion (the currently accepted mode of formation). Unfortunately these four satellites are so small that they could not have accommodated any reasonable energy source capable of causing the observed crustal evolution. The authors suggest strong local concentrations of radioactive heat generators rather than uniformly distributed radiogenic substances, such as those that helped mould the earth's surface. (Plescia, J.B ., and Boyce, J.M .; "Crater Densities and Geological Histories of Rhea, Dione, Mimas and Tethys," Nature, 295:285, 1982.) Comment. Interestingly enough, local concentrations of radioactivity have been discovered on the moon. From Science Frontiers #20, MAR-APR 1982 . 1982-2000 William R. Corliss ...
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... complex organisms the genes are separated by segments of genetic material that apparently have nothing to do with the manufacture of protein. Because there seems no need for these inserted jumbles of genetic information, they are characterized as "nonsense." But evolutionists insist that this nonsense must have some survival value or it wouldn't be there! Present speculation is that the nonsense segments separate mini-genes that contain the blueprints for assembling well-defined parts of proteins that possess specific functions. To illustrate, the main part of the immunoglobulin molecule has four functional parts (one for interacting with cell membranes, another that functions as a hinge, and so on). Lo and behold, the immunoglobulin gene consists of four mini-genes separated by three segments of nonsense. The suspicion is that the evolution of higher life forms has been accelerated by keeping these prefabricated, functionally oriented mini-genes apart and shuffling them as integral units. The shuffling of entire functional elements rather than smaller bits and pieces of genetic information might speed up organic evolution. (Lewin, Roger; "Why Split Genes?" New Scientist, 82:452, 1979.) From Science Frontiers #8 , Fall 1979 . 1979-2000 William R. Corliss ...
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... , we must be the first and only intelligent civilization. Essentially Tipler was criticizing the prevailing notion that, from a statistical point of view, there must be many other civilizations among the numberless stars and galaxies. Tipler's thoughts evoked a richly provocative group of letters, some of which were published in the March 1982 issue of Physics Today along with a closely related article by Ornstein. Ornstein tackled the problem of estimating the probability that intelligent life would evolve on other planets from a biologist's perspective. Whereas some physical scientists have set this probability at about 1.0 , Ornstein inclines toward 10-9 , believing that intelligent life is probably unique to the earth. But concludes Ornstein, the 15 separate developments of eyes among disparate terrestrial organisms may infer some unrecognized directing factor in evolution that would force him to revise his estimate upwards drastically. On the other hand, those 15 eyes might indicate a common, but still undiscovered, eye-possessing ancestor far back along evolution's track. The fossil record might be mute on this matter because eyes are soft tissues that are rarely preserved or perhaps because many eyes were jettisoned because the organisms didn't need them, as cave dwellers are wont to do with surprising rapidity. Some of the letters responding to Tipler questioned whether an intelligent civilization would be stupid enough to build self-reproducing von Neumann machines for galactic exploration. Wouldn't it be far more fun to go in person rather than by proxy? And, some pointed out, von Neumann machines would be ravenous consumers of energy and materials and might ...
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... Sourcebook Project Sourcebook Subjects Or did it drift in from without?Hoyle and Wickramasinghe conceive the cosmos as a seething retort of energy, gases, dust, and, most significantly, organic molecules and microbes. The space between the stars is more important than the stars themselves, for this thin soup is, in their view, the real "swamp" where life originated! The main evidence supporting their radical hypothesis consists of spectrograms, particularly in the infrared, which are difficult to account for on an inorganic basis, but which are fitted nicely by some organic materials, especially microbes. Hole and Wickramasinghe devote most of the present article to making a spectroscopic case for their theory, but near the end they shake the Temple of Science a bit: "Precious little in the way of biochemical evolution could have happened on the earth. It is easy to show that the two thousand or so enzymes that span the whole of life could not have evolved on the Earth. If one counts the number of trial assemblies of amino acids that are needed to give rise to the enzymes, the probability of their discovery by random shufflings turns out to be less than 1 in 1040000." They conclude that the genes that control the development of terrestrial life must have evolved on a cosmic scale, where there has been more time and much more room for shufflings. (Hoyle, Fred, and Wickramasinghe, Chandra; "Where Microbes Boldly Went," New Scientist, 91:412, 1981.) Comment. Could not the "new" bacteria that appeared in the Mt. St ...
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... Science Frontiers ONLINE No. 24: Nov-Dec 1982 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Africa not man's origin!The following abstract is from a 1982 paper in Nature. "It has been suggested that the evolution of man took place in Africa. This suggestion results from the unusual abundance of fossil material in Africa that is quite ancient in comparison with what is known elsewhere. The theory of an African origin has influenced the interpretation of the age of some non-African archaeologial sites. A case in point is the 'Ubeidiya locality in Israel, which is generally considered to be about 700,000 yr old because it has been assumed by a few that the associated Early Acheulian tool industry, and the persons who used it, would have taken considerable time to disperse from Olduvai Gorge to this non-African site in Israel. Here we evaluate fossil mammals from 'Ubeidiya, which are stratigraphically and directly associated with Early Acheulian artifacts, and find no substantial reason for considering the locality younger than 2Myr, and possibly as much as 500,000 yr older than any record of Early Acheulian artefacts or Homo erectus in Africa." (Repenning, Charles A., and Fejfar, Oldrich; "Evidence for Earlier Date of 'Ubeidiya, Israel, Hominid Site," Nature, 299:344, 1982.) From Science Frontiers #24, NOV-DEC 1982 . 1982-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 7: June 1979 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Moon And Life There are so many examples of lunar rhythms in terrestrial life that we tend to assume that these phenomena are understood. Obviously, evolution "created" these rhythms to further the cause of each moon-tuned organism. Palmer and Goodenough recount the classic example of the lunar synchronism of the palolo worm and add the even-more-amazing tale of P. megalops, another marine worm. Sure enough, the moon-modulated matings of these worms seem to improve reproductive efficiency. Less well known are many other moon-synchronous biological rhythms; viz., the sizes of the pits dug by ant lions to trap ants and the angles flatworms assume in swimming away from light. Many such lunar rhythms apparently have no adaptive value whatsoever. So, why do they exist? Even more disconcerting is the fact that lunar rhythms persist in the lab where the moon is not visible. Are internal clocks responsible here? If so, how do they work and how are they set? These questions are hard to answer if the rhythms have no value to the organism's success. (Palmer, John D., and Goodenough, Judith E.; "Mysterious Monthly Rhythms," Natural History, 87:64, December 1978.) Comment. It would, or course, be outright heresy to suggest that heavenly bodies may be the sources of unrecognized but biologically significant forces. Reference. Correlations of lunar phase ...
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... Science Frontiers ONLINE No. 18: Nov-Dec 1981 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Burgess Shale Puzzle In British Columbia, a middle Cambrian (550 million years BP) formation called the Burgess Shale has miraculously preserved a vast assemblage of soft-bodied sea creatures, especially arthropods. Does this rich and unusual deposit help elucidate arthropod evolution? No, it has complicated the problem. Few of the fossil arthropods can be easily related to groups now living. The Burgess Shale arthropod population is primitive in some ways but remarkably specialized in others. Some of the fossils have body segments like those in one recognized arthropod group but display limbs resembling those of an entirely different group. (Fortey, R.A .; "The Burgess Shale: A Unique Cambrian Fauna," Nature, 293: 189, 1981.) Comment. It appears that Nature was shuffling the gene deck, or that there was rampant hybridization, or that confusing programs for evolutionary change were drifting in from the cosmos a la Hoyle and Wickramasinghe! From Science Frontiers #18, NOV-DEC 1981 . 1981-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 13: Winter 1981 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Terrestrial Life Older Than Expected The oldest fossils found so far are dated at 3.5 billion years ago. Discovered in Australia, these life forms seem to have been capable of synthesizing their own food, much like present-day plants. In other words, these life forms were not so primitive after all. If we are to assume that still simpler life and pre-life chemical evolution preceded these fossils, the advent of life on earth must be pushed back much farther to allow time for gestation. (Anonymous; "Oldest Life-Forms May Have Made Own Food," Eos, 61:578, 1980.) Comment. Another possibility is that life did not originate on earth and was instead brought here on comets, meteorites, etc. From Science Frontiers #13, Winter 1981 . 1981-2000 William R. Corliss ...
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... ?Down the years, astronomers have been able to divide almost all stars into two groups: Population I, made up of young stars enriched by the products of their ancestors; and Population II, those relatively older ancestor stars containing more hydrogen and fewer heavier elements. Population I, according to present thinking, was formed out of the "ashes" of Population-II stars. What is missing from the picture are PopulationIII stars -- stars almost devoid of elements heavier than hydrogen and helium, and formed while the Big Bang was still echoing throughout the cosmos. Current astrophysical theory requires "ashes" from Population III to create Population II. Do the astronomers find any primordial Population-III stars kicking around? Hardly a handful; not nearly enough to satisfy the prevailing model of stellar evolution. One explanation is that Population-III stars have been around long enough to collect a camouflaging veneer of metallic debris. Some astronomers surmise that Population-III stars are truly extinct for some unknown reason. (Anonymous; "Where Is Population III?" Sky and Telescope, 64:19, 1982.) From Science Frontiers #23, SEP-OCT 1982 . 1982-2000 William R. Corliss ...
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... -Australian telescopes has revealed that several normal elliptical galaxies are surrounded by shell-like structures. D.F . Malin and D. Carter report that these envelopes are vast -- up to 180 kiloparsecs in diameter. Furthermore, some galaxies are wrapped in a series of thin shells. Malin and Carter believe that the colossal shells are really thin layers of stars either created by a powerful shock wave during galaxy formation or comprised of a debris layer of old stars blown out of the galaxy during some cataclysmic event. (Malin, David F., and Carter, David; "Giant Shells around Normal Elliptical Galaxies," Nature, 285:643, 1980.) Comment. This article typifies the emergence of "catastrophic astronomy" which contrasts sharply with the older vision of a leisurely evolution of stars and galaxies. From Science Frontiers #12, Fall 1980 . 1980-2000 William R. Corliss ...
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... As a result, older Miocene deposits now overlie younger Pliocene deposits. Direct observations of the pressure in the zone where the shearing occurs showed it to be some 20 bars higher than the equilibrium pressure of 550 bars. This higher pressure may support the theory that low-angle thrust faults many kilometers wide are physically possible because high pressure fluids lubricate the shear zone, allowing massive thicknesses of sediments to slide over one another without resulting in wholesale fracturing and obvious damage. (Anderson, Roger, N.; "Surprises from the Glomar Challenger," Nature, 293:261, 1981.) Comment. Scientific creationists have long thought that the many low-angle thrust faults, where many miles of older rock are superimposed on younger rock, contradict geological dating schemes and therefore the theory of evolution. Establishment geologists, although somewhat amazed at the sizes of some of the overthrusts, especially one in Wyoming, have never despaired of finding a reasonable physical mechanism that would preserve the Law of Superposition and the idea of dating rocks by their included fossils. The Glomar Challenger results should buoy their spirits. Nev-ertheless, we must wonder how widespread stratum shuffling really is. What stratigraphic sequence is now immune from claims that some of its members were inserted in the wrong order timewise? Reference. For more on "stratum shuffling" see ESR3 in our Catalog: Inner Earth. To order, visit: here . From Science Frontiers #19, JAN-FEB 1982 . 1982-2000 William R. Corliss ...
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... when available, human artifacts are systematically arranged around the bower. Some bowerbirds even take a piece of bark in their bills and paint their bowers with colored berry juices. Each species has a certain style, but the bowers vary from individual to individual and with the age of the bird. Manifestly, these birds use tools for artistic purposes. Or do they? Is it all instinct? Some animal behaviorists believe the bower's purpose is to attract mates, but the males often chase females away, although mating does eventually occur within the bowers. A second explanation is that the bowers symbolize territorial rights. In this context, bowerbirds fre-quently raid and destroy neighboring bowers, stealing choice decorations -- all very human-like behavior. (Diamond, Jared M.; "Evolution of Bowerbirds' Bowers: Animal Origins of the Esthetic Sense," Nature, 297:99, 1982.) Comment. Is human art any more profound than that of the bowerbirds? Human artists doubtless feel they are doing something more than attracting mates or proclaiming territory. Unfortunately, we cannot ask the bowerbirds what they are thinking as they carefully select colors and develop designs. From Science Frontiers #22, JUL-AUG 1982 . 1982-2000 William R. Corliss ...
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... . 14: Winter 1981 Supplement Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Beetles Make Scents Termite nests frequently host foreign species that seem to be accepted as fellow termites. Can't termites recognize the invaders? The authors believe that termites probably recognize one another by specific hydrocarbon labels synthesized on their cuticles. If the alien species were to be somehow marked with similar chemical identifiers, the blind termites might not know the difference. Howard et al think this may be the case with a species of beetle often found integrated into termite society. By chemi-cally analyzing beetle and termite cuticles, they have found both wearing the same hydrocarbon labels. Furthermore, the beetles synthesize their own chemical masks. This is an astounding instance of parallel or convergent evolution between remotely related species. (Howard, R.W . et al, "Chemical Mimicry as an Integrating Mechanism....," Science, 210:431, 1980.) Comment. Synthesizing exactly the right hydrocarbons was certainly a great stroke of good fortune for the beetles! From Science Frontiers #14, Winter 1981 . 1981-2000 William R. Corliss ...
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... No. 16: Summer 1981 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Earth-moon fission: a slight hint Although the Sm/Nd isotope ratios of the earth and the chondrites (a type of meteorite) seem pretty close in value, the possibility of a slight but significant discrepancy remains. If this small difference is confirmed, it would strongly imply that the earth's Sm/Nd ratio was shifted after the planet's formation. The most reasonable event that could shift this ratio is an long-debated earth-moon fission, wherein the earth's lighter surface material was somehow torn off to form the moon. (DePaolo, Donald J.; "Nd Isotopic Studies: Some New Perspectives on Earth Structure and Evolution," Eos, 62:139, 1981.) Comment. The moon's density is markedly less than the earth's , so the idea is not as wild as it seems. The hypothetical fission of Earth-Moon could have shifted the Nd isotope ratio in relation to that of the chondrites. From Science Frontiers #16, Summer 1981 . 1981-2000 William R. Corliss ...
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... prefer flashy finery and thus put evolutionary pressure on the development of these characteristics. A large-scale study by Baker and Parker indicates that Darwin erred and that the evolutionary pressure comes instead from predators avoiding brightly colored targets. Instinct tells the predators -- incorrectly in many cases -- that colorful prey taste bad or are noxious. The remarkable (possibly strange) aspect of bird coloration is the incredi ble external similarity of unrelated birds occupying similar habitats. Example, the American Eastern Meadowlark (left) closely resembles the African Yellowthroated Longclaw (right). (Krebs, John R.; "Bird Colours," Nature, 282:14, 1979.) Comment. Two questions cannot be repressed: How do the genes orchestrate this amazing convergence in response to environmental factors? Why was evolution not equally clever in equipping predators with countermeasures to see through these ruses? From Science Frontiers #10, Spring 1980 . 1980-2000 William R. Corliss ...
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... closely. They swam pointed in roughly the same direction, maintaining about the same spacing through the groups, which sometimes numbered 100 or more. They did not feed, mate, or do anything collectively; but once in a while an individual would suddenly engage briefly in acrobatic behavior -- one common type was dubbed the "shimmy dance." The researchers concluded that these shark groups had no obvious purpose and that, for reasons beyond the ken of man, this behavior somehow contributed to their evolutionary success. (Klimley, A. Peter; "Grouping Behavior in the Scalloped Hammerhead," Oceanus, 24:65, Winter 1981/1982.) Comment. The sharks might be much "farther along" without complex, time-wasting group behavior. What do sharks know about evolution anyway? From Science Frontiers #20, MAR-APR 1982 . 1982-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 23: Sep-Oct 1982 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Facing Up To The Gaps The textbooks and professors of biology and geology speak confidently of the fossil record. Darwin may have expressed concern about its incompleteness, but, especially in the context of the creation-evolution tempest, evolutionists seem to infer that a lot of missing links have been found. Some scientists, however, are facing up to the fact that many gaps in the fossil record still exist after a century of Darwinism. One has even dispaired that "the stratigraphic record, as a whole, is so incomplete that fossil patterns are meaningless artefacts of episodic sedimentation." D.E . Schindel, Curator of Invertebrate Fossils in the Peabody Museum, has scrutinized seven recent microstratigraphical studies, evaluating them for temporal scope, microstratigraphical acuity, and stratigraphical completeness. His first and most important conclusion is that a sort of Uncertainty Principle prevails such that "a study can provide fine sampling resolution, encompass long spans of geological time, or contain a complete record of the time span, but not all three." After further analysis he concludes with a warning that the fossil record is full of habitat shifts, local extinctions, and general lack of permanence in physical conditions. (Schindel, David E.; "The Gaps in the Fossil Record," Nature, 297:282, 1982.) Comment. This candor makes one wonder how much of our scientific philosophy should be based upon such a shaky foundation. From ...
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... Science Frontiers ONLINE No. 5: November 1978 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Obscure Origin Of Insects And Their Wings The earliest fossil insect is a wingless springtail found in Scotland's Devonian cherts, which conventional dating schemes tell us are about 350 million years old. Some biologists doubt that springtails should be classified as true insects. In any event, these ancient springtails are considered too specialized to be the ancestors of modern winged insects. The next insects in the fossil record appear suddenly in the Upper Carboniferous (300 million years ago) with fully developed wings. There exists an embarrassing 50-million-year gap between the fossil springtails and the more specialized insects. Evolution requires that this gap be filled with many random experiments at insect construction, including the first attempts at fashioning wings. Whalley admits the gap and the total mystification of paleontologists about how insects and biological flight first developed. Perhaps, he surmises, wings may have been the natural extrapolation of flap-like outgrowths required for body cooling. Random mutations would have added the muscles needed to orient the flaps and move them to improve circulation! (Whalley, Paul; "Derbyshire's Darning Needle," New Scientist, 78:740, 1978.) From Science Frontiers #5 , November 1978 . 1978-2000 William R. Corliss ...
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