69 results found.
... Science Frontiers ONLINE No. 49: Jan-Feb 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Grounded Bats Nicheless New Zealand boasts two bat species (Mystacina) which can fly but really prefer to clamber around on the ground hunting for insects, pollen, and fruit. So far, these bats have defied classification. They are distinctly different from their flying cousins in the area. Blood protein analysis links them to tropical bats in South America. No oth-er bats from New Zealand and Australia show such a relationship. Although these two oddball species may have flown in from South America some 80 million years ago, when the land masses were thought to be much closer, one then has to explain how these tropical bats survived the Ice Ages that afflicted New Zealand. (Anonymous; "Grounded Bats," New Scientist, p. 25, October 2, 1986.) From Science Frontiers #49, JAN-FEB 1987 . 1987-2000 William R. Corliss ...
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... navigation. The outward manisfestation of time-keeping is in the precise timing of the colony's nomadic phase of 15 days (during which larvae are growing) and the 20-day stationary phase (during which pupae develop). The queen's egg-laying also conforms with this schedule. Raids into the rain forest occur in both phases. Perhaps more remarkable is the systematic orientation of the raids in the stationary phase. These raids are separated by an average 123 , as diagrammed. This scattering allows time for new prey to enter the previously raided areas. But how does the colony determine direction in the dense rain forest? Probably from polarized sinlight, thinks Franks. But here we have a problem: each army ant, instead of having multi faceted compound eyes like most insects, has just a single facet in each eye. "The mystery is how the colony can navigate with each of its workers having such rudimentary eyesight. In my wildest dreams, I imagine that the whole swarm behaves like a huge compound eye, with each of the ants in the swarm front contributing two lenses to a 10- or 20-m wide 'eye' with hundreds of thousands of facets." (Franks, Nigel R.; "Army Ants: A Collective Intelligence," American Scientist, 77:139, 1989.) Comment. By analogy, the human body is a colony of individual cells, most of which are specialized in some way. Individual human cells can be grown alone, but they are as directionless as the 100 ants on the flat ...
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... Science Frontiers ONLINE No. 99: May-Jun 1995 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Biological precursors of the 1995 kobe earthquake The Japanese are meticulous observers of animals. Many keep birds, insects, fish, etc. as pets. When scientists at the Osaka City University asked for reports of unusual animal behavior around the time of the great January 17 quake, over 1,200 people in the Kobe-Osaka area came forth with anecdotes. Some typical pre-quake observations were: Doves flying into walls. Caged birds (Chinese hawk-cuckoos) flying against the sides of their cages. Fish rising to the surface in great numbers. At the port of Shioya, "millions" of gizzard shad turned the surface of the water into silver. Captive stag beetles and turtles emerging from hibernation. And strangest of all, silkworms and fish in ponds orienting themselves in the same directions. (Minami, Shigehiko; "Creatures Went a Bit Batty, Maybe Knew Quake Was Coming," Asahi Evening News, February 25, 1995. Cr. N. Masuya) Cross reference. Many luminous phenomena were also seen. For descriptions of so-called "earthquake lights" refer to GLD8 in our catalog Lightning, Auroras, etc. It is listed here . From Science Frontiers #99, MAY-JUN 1995 . 1995-2000 William R. Corliss ...
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... Could these radically different forms of the same species have had separate and different evolutionary histories? Our title comes from L. Van Valen's review of a book by D.I . Williamson entitled Larvae and Evolution: Toward a New Biology . We can only touch upon a few of the many profound anomalies raised by the book. We begin with a paragraph from Van Valen's review: "Williamson has given us a new set of anomalies. Mostly he does this by showing that what we know doesn't fit together as well as we thought it did. In particular, the major phylogeny of the animal kingdom as estimated from adult characters doesn't fir very well with that estimated from larvae. Such a discrepancy for different stages has occasionally been reported within families of insects, and it has an apparent resemblance to the discordance occasionally found between phylogenies inferred from morphological and molecular characters. In such cases, the usual conclusion (I ignore data chauvinists) is that we should somehow use all the available information to infer the correct phylogeny. After all, there was just one real phylogeny that occurred in the past, and we want to find it as closely as we can." Comment inserted by the compiler. Van Valen is saying that three evolutionary Trees of Life can be drawn from adult morphology, DNA structure, and larval morphology, and that they may not look the same. Caterpillars may yield a family tree different from that inferred from the butterflies. Which is correct, or are they all correct? Back to the review. Waxing heretical, ...
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... Science Frontiers ONLINE No. 102: Nov-Dec 1995 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects From dust unto abyssal mud We know the Creator made at least one species from dust, but ocean-floor mud has turned out to have more biodiversity. Twenty years ago, biologists put the number of species at about 1 million. Then, they started shaking and gassing rain-forest canopies. The rain of new insect species that fell to the ground made them revise the estimate to 30 million. The latest, long-unappreciated reservoir of undescribed species is mud -- oceanic mud. In particular, we know that the mud in the Rockall Trench off the western coast of Scotland teems with untold species of diminutive nematodes. Of course, nematodes are not as pretty as birds and fish, but they are nevertheless bona fide species of life. Examination of the Rockall mud and that from other seabed sites has convinced the nematode counters that there may be as many as 100 million nematode species on our planet. When other classes of life are added, the figure rises to at least 130 million. (Pearce, Fred; "Rockall Mud Richer than Rainforest," New Scientist, p. 8, September 16, 1995.) Comments. Lifeless molecules can apparently unite to form an almost infinite array of life forms! The next reservoir of unexplored biodiversity may be the crevicular realm -- all those fluid-filled crevices and channels that extend miles down into the earth's crust. They are full of bacteria ...
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... : Nov-Dec 1995 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Remnants of tunguska When something exploded over Siberia on June 30, 1908, flattening more than 2,100 square kilometers of forest, it left no crater of consequence and no obvious pieces of itself. Scientists have claimed all along that it was a comet or asteroid that detonated in the atmosphere. A few less conservative people ventured that it was an alien spaceship that blew up! G. Longo and colleagues, Universita di Bologna, have apparently found a way to determine the true nature of this invading object. They examined the resin in the conifers surrounding the site of the blast to see if any particulate debris had been trapped in the sticky goo -- much as ancient insects have been preserved in amber. "Longo and associates used a scanning electron microscope to examine 7,163 particles recovered from the site and from two control sites. They found anomalously high abundances of elements such as iron, calcium, aluminum, copper, gold, zinc, and oxygen in the Tunguska-site samples, strongly peaking around 1908." Their conclusion: The impactor was a stony meteorite of normal density. (Anonymous; "Remnants of Tunguska," Astronomy, 23:26, October 1995.) From Science Frontiers #102 Nov-Dec 1995 . 1995-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 67: Jan-Feb 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Really-deep rivers "Ecologists studying rivers have discovered a vast subterranean world filled with dozens of previously unknown species of worms, shrimp, insects and microscopic organisms that live in the groundwater below the stream channel and sometimes for miles on each side." The quotation above once again evokes the concept of "crevicular structure" in the crust. The crevicular world is that immense, unappreciated maze of underground space created by cracks in the rocks, solution channels, permeable gravels, and so on. In the article reviewed here, a crevicular realm has been discovered underneath river beds. But this is just a special case of a subterranean world found many places beneath the surface -- even under the continental shelves. The surface waters we see are just (to use an aquatic metaphor) the tip of the iceberg! Sub-river life lives far under the beds of the great Alaskan rivers and even small desert streams in Arizona. Preliminary exploration has shown that fluid-and life-filled crevicular structure exists at least 30 feet under river beds and may extend several miles to either side. For example, water wells drilled two miles from the Flathead River, in Montana, yield immature stoneflies. J. Stanford, Director of Montana's Flathead Lake Biological Station states, "We have basically enlarged the concept of what a river is." He and his colleagues have found at least a dozen new species in the crevicular ...
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... This Issue Sourcebook Project Sourcebook Subjects The star of the star-nosed mole (Left) Tenticle-like rays surrounding one nostril of the star-like mole. (Right) The number of rays around the other nostril give the density of sensory receptors. The star-nosed mole is one of North America's more bizarre mammals. Its nostrils are surrounded by mobile, Medusa-like appendages that are richly suppled with nerves and blood vessels. These tentacle-like structures form the "star," which has long been considered a tactile organ used for feeling for prey. However, behavioral experiments by E. Gould et al indicate that the star may be more than a tactile organ. It seems to sport electrical sensors that detect the minute electrical fields surrounding worms, leeches, insect larvae, and other favorite mole tidbits. This conclusion derives from experiments in which starnosed moles preferentially attacked the parts of worms that are most strongly electrical. Actually, scientists have been puzzled as to how this mole found its prey, for this mammal is semiaquatic and somehow locates its dinner in muddy water even though it has poor eyesight. Although some fish possess electrical sensors, they are uncommon in mammals. Half way around the planet, another strange creature, also classified with the mammals, frequents muddy waters looking for the same sort of prey favored by the star-nosed mole. The Australian platypus also has weak vision and employs search techniques similar to those of the mole. Instead of sensor-bearing tentacles on its prow, the platypus has a duck-like bill loaded with ...
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... upon sunlight for its survival. The ecosystems clustered around the deep-sea vents and the bacteria found in deep aquifers demonstrate that the sun is not essential to life -- chemical energy does just fine. In fact, the domain of chemosynthetic life has now been extended to a Romanian cave that has apparently been almost completely sealed off from surface influences for 5.5 million years. Air does leak in through tiny cracks, and water partially fills the cave. What is most remarkable in this sunless, sealed ecosystem is its biodiversity: 48 animal species, including 33 brand-new species. The roster includes isopods, a millipede, a centipede, a water scorpion, and a leech. Of course, bacteria and fungi thrive there, too. In contrast to unsealed caves, where insects, bats, and other sources of food filter in from the surface, life in the Romanian cave seems to derive entirely from hydrogen sulfide present in the cave's rocks. This compound is consumed by microorganisms, which are then grazed by cave occupants higher up the food chain. A NASA scientist has called Movile cave a "Mars analog site." And indeed it might be, for Mars has plenty of rocks and subsurface water. (Skinrud, E.; "Romanian Cave Contains Novel Ecosystem," Science News, 149: 405, 1996) Comments. Fluid-filled cracks and pores extend miles down below the earth's surface. It would be surprising if novel ecosystems do not exist there, too. The ice-sealed Antarctic lakes (see next item ...
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... Science Frontiers ONLINE No. 115: Jan-Feb 1998 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Genes vs. memes Vital to the concept of "gene wars" (mentioned in SF#114) is the assumption that our destiny is controlled by "selfish genes" (or "selfish DNA"). The idea that evolution works only at the gene level has been championed by R. Dawkins, and today it dominates much evolution philosophy. However, this "genetic imperialism" is now being challenged by some scientists who insist that culture also affects an organism's evolution, be it a human or an insect. In fact, it was Dawkins himself who first proposed the term "meme" for the cultural counterpart of the gene. A meme, in other words, is an "element" of culture that can be passed along to progeny by imitation and/or cultural pressures. In reductionist thinking, environmental challenges are met by gene mutations plus natural selection. In meme theory, the same challenges are confronted by cultural changes (meme "mutation") plus natural selection. The meme approach is holistic rather than reductionist and is appealing because it allows us some control over our destiny. There are several phenomena in which some scientists profess to see memes overpowering the genes: Generations of female infanticide have led to more male births than female births. In dairy-farming societies, 90% of the population has the enzyme lactase that allows individuals to digest cows' milk. In other societies, 80% ...
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... "Gallery" pages of Discover, several incredibly colored and patterned shrimp stun the eyes of the reader. Some of these shrimp put the gaudiest butterflies and birds to shame. We won't stop here to dwell on why some shrimp are so colorful while others are so tasty. The anomaly at hand is buried in the caption describing the red-andwhite striped peppermint shrimp, which decorates the Great Barrier Reef. It turns out that this shrimp, like the Atlantic spiny lobster, sometimes joins up with others of its species to form long moving trains or chains of animals. This behavior remains very puzzling to biologists. (Anonymous; "Shrimp You Won't Find in Your Cocktail," Discover, 6:55, March 1985.) Comment. Do shrimp belong with the insects? Yes, they are all arthropods. From Science Frontiers #39, MAY-JUN 1985 . 1985-2000 William R. Corliss ...
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... plants do not "see," but the pigments provide environmental information. Here's the mechanism: plant leaves reflect infrared light well, so when a tomato plant's pigments detect a lot of infrared, the plant "thinks" that it may be crowded out by competing vegetation. The tomato plant responds aggressively by growing more rapidly. The red plastic mulch between the rows also reflects a lot of infrared light, and it thereby tricks the tomato plant into accelerating its growth. (Raloff, Janet; "When Tomatoes See Red," Science News, 152:376, 1997.) Fire-detecting beetles. The beetle Melanophila acuminata seeks out forests that have just been ravaged by fires so that it can lay its eggs in the nutritious, freshly burnt wood. These insects are capable of detecting fires up to 32 kilometers (20 miles) distant. They do not see the fire with their eyes but instead detect the thermal (infrared) radiation with a special organ on their chests. (Schmitz, Helmut, et al; "Infrared Detection in a Beetle," Nature, 386:773, 1997.) Knees "see". Well, sort of, and then only the backs of the knees. Human circadian clocks can be shifted by shining visible light on the skin on the backs of the knees. It is theorized that the light penetrates the skin and causes chemical changes in the blood, implying that human blood contains "chronobiological photoreceptors." (Oren, Dan A., and Terman, Michael; "Tweaking the Human Circadian ...
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... Science Frontiers ONLINE No. 74: Mar-Apr 1991 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects 'TERMITE BANDS' IN SOUTH AFRICA Few animals besides man have significantly affected our planet's geology. To be sure, corals built the Great Barrier Reef and beavers left their mark on the hydrology of parts of Canada and the U.S .; but termites!? It seems that in southern Africa this industrious insect is responsible for enormous striped patterns of ridges and vegetation bands. These amazingly regular patterns are caused by alternating low ridges and gullies. The ridges are about 2 meters high, up to a kilometer long, and separated by about 50 meters. The ridges themselves are closely spaced termite mounds. Just why the termites choose to build their mounds in long rows is an unanswered question. And how do the termites maintain strict parallelism, especially since they are blind? How could termites in one mound know how their neighbors in the nearest ridge, 50 meters away, are building their mounds? Anyway, the ridges help channel the flow of water and thus the growth of vegetation, giving immense swathes of country a corrugated appearance. (Sattaur, Omar; "Termites Change the Face of Africa," New Scientist, p. 27, January 26, 1991.) Comment. In Australia, the so-called "magnetic" termites build their slab-like mounds so as to minimize the amount of sun-generated heat. From Science Frontiers #74, MAR-APR 1991 . 1991-2000 ...
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... Science Frontiers ONLINE No. 44: Mar-Apr 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Evolving on half a wing (and a prayer?)Just about everyone agrees that half a wing is of little use to an animal "straining" to develop the capability of flight. So, how did the marvelously crafted wings of birds, insects, and mammals evolve in infinitesimal steps? Biologists, including Darwin himself, have long puzzled over this. Stephen Jay Gould in a recent article explores a currently favored way of circumventing the negligible additional survival value of half a wing, or even 90% of a wing. This solution (? ) maintains that protowings were not "intended" for flight at all but were developed initially as aerodynamic stabilizers, thermoregulatory systems, sexual attractors or other functions requiring large areas. Gould describes the experiments of Kingsolver and Koehl in which protowings were modelled and tested for their thermoregulatory and flight values. Surprisingly, there was a sharp transition, as the size of the protowing increased, from good thermoregulation but poor flight capability to the reverse -- good flight capability and poor thermoregulation. In other words, a structure developed for one purpose, if enlarged, might be useful for something else! (Gould, Stephen Jay; "Not Necessarily a Wing," Natural History, 94:14, October 1985. See also: Lewin, Roger, "How Does Half a Bird Fly?" Science, 230:530, 1985.) Comment. The work of Kingsolver and Koehl ...
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... using the environmental sound reflected from them. J. Potter and his colleagues at the National University of Singapore have constructed an array of underwater microphones that detects "slices" of the acoustical environment around it. When processed by a computer, images of objects emerge by virtue of the background noise reflected from them. This group has also estimated the ability of dolphins to detect and process background noise. They suggest that dolphins should be able to "see" objects at least 25 feet away without even using their active sonar; that is, their clicks. This passive acoustical imaging would be a useful evolutionary development because dolphin clicks warn some prey and allow them to escape. (Anonymous; "Cacophony of the Deep," Discover, 19:19, May 1998.) Comments. Some insects can detect the sonar cries of pursuing bats and take evasive action. Perhaps some fish can detect pursuing dolphins, too. Blind people can augment facial vision by tapping with a cane or using a mechanical clicker. From Science Frontiers #120, NOV-DEC 1998 . 1998-2000 William R. Corliss ...
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... the above. We have a different story to tell. These blips, representing queries and responses, are not generated by human-built radars or by electrical fish, but rather by animals much 'lower' on the evolutionary ladder -- fireflies. This illustration is Fig. 3 in a lengthy review article and carries the following unilluminating caption: "Examples of Entrainment of femme C's (see Table 3) Responses to Multiple Counterfeit Flashes." It seems that we have some sort of electronic warfare between the femme (predatory female fireflies that lure other fireflies with false signals) and the preyed-upon species. The many pages describe all sorts of feints, verification signals, and other stratagems. (Carlson, Albert D., and Copeland, Jonathan; "Communication in Insects," Quarterly Review of Biology, 60:415, 1985.) Comment. It is impossible to do justice to this paper in this short review, but two things should be mentioned: (1 ) Fireflies may be considered "low" on the evolutionary ladder, but their tiny brains certainly process a lot of data in complex ways; and (2 ) In southeast Asia, massed fireflies flash in synchronism along some riverbanks, creating one of the great spectacles of nature. See our Handbook Incredible Life for details. For a description of this book, visit: here . From Science Frontiers #44, MAR-APR 1986 . 1986-2000 William R. Corliss ...
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... performances that greatly exceed what is required for the tracking of animals and the grubbing of edible roots. This is the human brain, of course. Not as widely appreciated for its versatility is the human vocal tract. It can generate much more than brute grunts. It renders operatic arias of great beauty and frequency range. The vocal tract can do even more than that; it can carry two musical lines simultaneously. This skill is called "throat-singing" or "overtonesinging." The best-known throat-singers live in the Tuva region of southern Siberia. The semi-nomadic herders of this wild region were evidently inspired to develop throat-singing so that they could better mimic the sounds they heard in nature: the singing of birds, the wind, the sounds of insects. Throat-songs have two components. The first is at a low, sustained fundamental pitch, which can be likened to the drone of a bagpipe. The second, superimposed on the low drone, is a succession of flute-like sounds that resonates high above the drone. It is the second component that can be controlled so as to mirror natural sounds. The result is like nothing Mozart or Verdi conceived. But it is an art form valued in Tuva and a talent rather remarkable from a biologist's perspective. One should compare the vocal tract to an organ pipe with its standing waves, except that the human pipe is only 7 inches long in the average adult male. One end of the human pipe is the mouth; the other is at the so- ...
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... Strandings of Live Cetaceans BMB34 Live and Mummified Seals Found Far Inland in Antarctica BMB35 Self-Anoiting in Mammals BMB36 Miscellaneous Curiosities of Mammal Behavior Leaf-Wrapping Bats Giraffe Necks Did Not Evolve for Grazing Some Cetaceans Suck in Their Food Chimps Hunt and Eat Other Mammals (Usually Monkeys) Convergence of Sperm-Whale and Elephant Behaviors How Mammals Express Emotions Mole-Rat Dispersive Morph Mouse Intelligence Improved by Gene Insertion BMC CHEMICAL AND PHYSICAL PHENOMENA BMC1 Biochemicals That Challenge Evolution BMC2 Possible Lunar Effects on Mammalian Biochemistry BMC3 Some Biochemical Curiosities in Mammals BMC4 The Inability of Some Mammals to Synthesize Ascorbic Acid BMC5 Anomalies Observed in the Cytochromes-Percent-Sequence Difference Matrix BMC6 Miscellaneous Blood and Biochemical Differences among Mammals Urine of Female Dogs Kill Grass But Not Male's Convergence of Shark and Camel Protein Convergence of Elephant and Insect Pheromone BMD DISTRIBUTION OF MAMMALS IN SPACE AND TIME BMD1 Remarkable Congregations and Concentrations of Mammals BMD2 Apparent Dearths and Absences of Mammals BMD3 Cycles in Mammal Populations BMD4 Exotic Mammals BMD5 Geographically Separated Populations of Flightless Mammals BMD6 Sharp Zoogeographical Divisions Despite Minimal Barriers to Movement BMD7 Decrease in Biodiversity with Latitude BMD8 Preference for Certain Geological Formations BMD9 Entombed Mammals BMD10 Late Survival of Mammoths and Mastadons BMD11 Current or Very Recent Survival of Giant Ground Sloths BMD12 Current Survival of the Thylacine BMD13 Current or Very Recent Survival of Steller's Sea Cow BMD14 Miscellaneous Potential Late Survivors Species Richness Correlated with Latitude BME THE FOSSIL RECORD OF MAMMALS BME1 Scarcity of Transitional Fossils in the Class Mammalia BME2 Persistence of Certain Mammalian Morphological Forms in the Fossil Record BME3 Explosive Radiations in Mammalian Evolution BME4 Unexplained Extinctions of Large Mammals BME5 The Failure of ...
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... Fighters) GLB19 Repeating Ball Lightning GLB20 Penetration of Physical Barriers by Ball Lightning GLB21 Miscellaneous Observations of Bizarre Ball Lightning Ball Lightning Contacting People Ball Lightning Penetrating Window Panes Illusory Ball Lightning Flowing Ball Lightning GLD DIFFUSE ELECTRICAL DISCHARGE PHENOMENA GLD1 Mountain-Top Glows GLD2 Intermountain Electric Discharges GLD3 Large-Scale St. Elmo's Fire GLD4 Moving, Surface-Level, Electrified Light Patches GLD5 Discharge Phenomena during Duststorms and Snowstorms GLD6 Unusual Forms of St. Elmo's Fire GLD7 Luminous Aerial Bubbles GLD8 Earthquake Lights GLD9 Volcano Lights GLD10 Tornado Lights GLD11 Whirlwinds of Fire and Smoke GLD12 Anomalous Flashes Detected by Satellites GLD13 Enhanced Luminosity of Rocks GLD14 Luminous Phenomena in Water and Ice GLD15 Dazzling Lights in and on Clouds GLD16 Luminous Patches Moving on Cloud Surfaces GLD17 Ground-Level Light Flashes The Zeitoun Phenomenon Luminous Discharges on Insects in Flight GLL LIGHTNING ANOMALIES GLL1 Luminous Phenomena Occuring above Thunderclouds (Rocket Lightning) GLL2 Bead Lightning GLL3 Colored Lightning with Unusual Features GLL4 Silent Lightning GLL5 Horizontal Lightning GLL6 Lightning from a Clear Sky GLL7 Crown Flash GLL8 Preference of Lightning for Certain Trees GLL9 Lightning Figures GLL10 Lightning Sounds (Other than Thunder) GLL11 Lightning's Pranks GLL12 Hot-Air Blasts Following Lightning Strokes GLL13 Unusual Geographical Preferences of Lightning GLL14 Black Lightning GLL15 Slow or Prolonged Lightning GLL16 Correlation of Lightning and Cosmic Rays GLL17 Lightning Superbolts GLL18 Cyclic Flashing of Lightning GLL19 Dual Lightning Discharges GLL20 Abnormally Long Lightning Strokes GLL21 Anomalous Electrical Fields and Currents during Lightning GLL22 Lightning Shadowgraphs GLL23 Wisps of Flame Left by Lightning Strokes GLL24 Tubular Lightning GLL25 Meandering Lightning GLL26 Ribbon Lightning GLL27 Spoked and Spider Lightning GLL28 Bipolar Nature of Large Electrical Storms GLL29 ...
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