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http://www.sciencenews.org/view/issue/id/3516
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In the December 5 Issue:
- TABLE OF CONTENTS
- Climate might be right for a deal: Copenhagen negotiations will take steps toward a climate-stabilizing treaty
- Botanical Whales: Adventures in the Tortugas reveal that seagrass fields need saving too
- Breaking the Speed Limit: Studies examine physiology and technology to better foresee the ultimate edge of human performance
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January 25th, 2003
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A team of Chinese paleontologists has discovered fossils of a small, feathered dinosaur that they say had four wings. (p. 51)
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Cosmologists say they have found compelling evidence that massive galaxies were already in place when the universe was less than a billion years old. (p. 51)
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A South African scorpion economizes as it stings, injecting a simple mix first, followed by a venom that's more complicated to produce. (p. 52)
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Dietary studies suggest that people who consume large amounts of vitamin A in foods or multivitamins are more likely to suffer hip fractures than are people who ingest modest amounts. (p. 52)
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A device that fits on the end of optical fibers may make possible the next big boost in Internet speed without new underground cables. (p. 53)
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Researchers have constructed an organism that synthesizes and incorporates an extra amino acid into its proteins. (p. 53)
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A study suggests that a brain structure called the amygdala assesses the emotional intensity of both pleasant and unpleasant sensations, thus challenging prior evidence that it primarily coordinates fear responses. (p. 54)
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Transplanted bone marrow can form new nerve cells in the brains of people. (p. 54)
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New computer simulations suggest that planets as massive as Jupiter may have formed in only a few hundred years rather than several million years, as the leading theory of planet formation requires. (p. 56)
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Researchers are developing methods for inactivating all sorts of pathogens that could be found in blood, including West Nile virus, an emerging infection recently brought to the United States from Africa. (p. 59)
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The first attempt to measure the speed of gravity finds it roughly equal to that of light, as expected, though not everyone agrees that the method used can actually measure gravity's speed. (p. 61)
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A common microorganism that adds a reddish tinge to some patches of snow may be a significant consumer of planet-warming carbon dioxide. (p. 61)
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Discarded vaginal contraceptive rings could interfere with fishes' reproduction by releasing estrogen into streams. (p. 62)
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Astronomers have solved the mystery of why supergranules—enormous cells of turbulent, charged gas on the sun's surface—appear to move across the sun faster than the sun rotates. (p. 62)
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A national study finds that about 13 percent of U.S. infants now routinely sleep in a bed with their mothers or other adults, intensifying interest in alleged health benefits and risks of bed sharing for babies. (p. 62)
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The sex hormones known as steroidal estrogens, which are used in hormone-replacement therapies and birth control pills, have joined a government list of known human carcinogens. (p. 62)
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