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http://www.sciencenews.org/view/issue/id/463
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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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May 13th, 2000
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Fossil skulls found in central Asia date to 1.7 million years ago and may represent the first ancestral human species to have left Africa. (p. 308)
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Ambient concentrations of smog ozone in many regions can cause lungs to leak, potentially compromising the health of even robust people. (p. 308)
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Two technologies for transferring genes, one that uses mobile DNA called transposons and another that uses a weak virus, have proved successful in overcoming genetic disorders in mice. (p. 309)
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Astronomers say they've likely confirmed that half of the hydrogen gas in the universe, which had not been accounted for, resides in relatively nearby reaches of intergalactic space. (p. 310)
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Swiss researchers find the first case of a female flashing ornaments that advertise her gene quality to choosy males. (p. 310)
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Important but imprecisely measured, the gravitational constant, G, is given its most exact experimental value yet, while a pioneering investigation into gravity finds that extra dimensions, if they do exist, occupy spaces of less than a couple tenths of a millimeter. (p. 311)
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Scientists from six countries have completed the sequence of human chromosome 21. (p. 311)
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Advances may make fish farming a healthy prospect, even for inner cities. (p. 314)
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Do captured viral genes make human pregnancies possible? (p. 318)
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When taken before or with meals, ginseng appears to help people with diabetes control the normal rise in blood sugar that accompanies eating. (p. 312)
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A common diabetes drug helps treat obesity and cure the infertility associated with polycystic ovary disease—even in people without diabetes. (p. 312)
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Substituting monounsaturated fats for polyunsaturated ones in cooking may hold hunger at bay longer. (p. 312)
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Animal studies indicate that enriching diets with soy and tea fights cancer better than adding either alone. (p. 312)
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For the first time, researchers have shown that bird pairs are more likely to divorce after raising young than after losing a nest of offspring. (p. 317)
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Tent caterpillars get more heat and insulation than scientists had expected. (p. 317)
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Bees that can take over even an Africanized-bee colony start by conning their nursemaids into giving them royal treatment. (p. 317)
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A Nipah virus outbreak in Malaysia may have started when bats spread disease to pigs. (p. 317)
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Beer consumption seems to boost concentrations of vitamin B6 in blood and coincides with lower concentrations of homocysteine, a risk factor for heart disease. (p. 317)
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