... Science Frontiers ONLINE No. 79: Jan-Feb 1992 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Spooky Spike The readers of New Scientist continue to supply delightful observations of Nature's quirks. The following is from J. Turner, in Warwickshire: I have in my garden a round red plastic container which holds water for the birds. In last winter's first hard frost, I found an odd ice formation in the bowl. Although the weather the previous day had been clement and the water was fluid, we had that night a sharp frost down to about -4 C. The following morning I noticed what appeared to be something sticking up out of the frozen water in the dish. On closer examination, it proved ... Science Frontiers ONLINE No. 79: Jan-Feb 1992 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Spooky Spike The readers of New Scientist continue to supply delightful observations of Nature's quirks. The following is from J. Turner, in Warwickshire: I have in my garden a round red plastic container which holds water for the birds. In last winter's first hard frost, I found an odd ice formation in the bowl. Although the weather the previous day had been clement and the water was fluid, we had that night a sharp frost down to about -4 C. The following morning I noticed what appeared to be something sticking up out of the frozen water in the dish. On closer examination, it proved ...

... - in the form of dark spots on satellite images of the earth's dayglow -- and late results continue to support this far-out interpretation, ridiculous or not. "The mass of these objects is estimated at about 108 gm each, and the total flux is about 107 small comets per year. If this flux is representative of the average flux over geologic time, then the water influx is sufficient to fill the Earth's oceans. The fluxes of these objects are also large for all the planets outside the orbit of Earth. Considerations of thermal stability imply that the fluxes of comets that impact Venus are considerably less. The outer giant planets may be significantly heated relative to solar insolation by the small-comet impacts. For example, the total energy input due both ... -we-know-it. The carbonaceous material basic to that same kind of life. (See SF#48.) The seeds of life, a la Hoyle and Wickramasinghe. Energy, as discussed above by Frank et al. Observe that Frank et al are saying that the kinetic energy in the flux of small comets is sufficient to raise a planet's temperature as well as supply water. In this light, exobiologists need not confine their search for extraterrestrial life to planets surrounding warm suns. Somewhere, far from stars, there may be places where comets may raise atmospheric temperatures to where life can prosper! Sunlight, of course, is not needed absolutely, as demonstrated by the profusion of life around deep-sea vents. From Science Frontiers #52, JUL- ...

... only topographic relief in the broad, gradually sloping plain." Some of the raised fields are remarkably sophisticated in design. At the base is a layer of cobblestones for stability. These are covered by a 10-centimeter layer of clay. On top of the clay are three distinct layers of sorted gravel; all capped by rich organic topsoil. These fields were simultaneously an aquifer for the fresh water percolating down from the surrounding hills and a barrier to the brackish water from Lake Titicaca. Even at Tiahuanaco's altitude, these fields could have grown potatoes, oca, or ulluco and the chenopod grains, as well as quinowa and caniwa. Tiahuanaco and its satellite cities could have been fed with enough left over for export. Not bad for farmers 2,000 years ago! ( ... Tiwanaku's ) many puzzles has been how food for such a large city was grown at an altitude of circa 3,850 meters (12,600 feet) in the frosty, windswept Bolivian Andes. This problem along with the fabulous stonework and extensive ruins have precipitated theories involving extraterrestrial visitors and an age for the site in the hundreds of thousands of years. At least the food-supply puzzle now seems to be in hand. Stereoscopic aerial photographs show in startling detail: ". .. immense, curvilinear platforms of earth...these fields form elevated planting surfaces ranging from five to 15 meters wide and up to 200 meters long...Extensive and nearly continuous tracts of these fields -- all of which have been abandoned for centuries -- run from the ...