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http://www.sciencenews.org/view/issue/id/8865
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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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September 1st, 2007
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Bacteria swap genes all the time, but it now appears that they can give their DNA to some animals as well. (p. 131)
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Microbes locked in 500,000-year-old permafrost appear to breathe and show other signs of very slow life. (p. 131)
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Orchids appeared on the scene about 80 million years ago, according to evidence from a bee that collected orchid pollen and got trapped in amber. (p. 132)
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Earth owes its oxygen-rich atmosphere to a change in volcanic activity about 2.5 billion years ago. (p. 132)
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A variety of school-based programs succeed in reducing students' violent and disruptive behavior. (p. 133)
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Infrared observations show water vapor pouring down on a planet-forming disk around a young star. (p. 133)
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A gene in some strains of the bacterium Helicobacter pylori may greatly increase the risk of stomach cancer. (p. 134)
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Many animals use mimicry to gain a competitive advantage, but are there degrees of cheating? (p. 136)
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Analysis of the connections among different types of economic activities explains why some countries succeed, and others fail, in diversifying their economies. (p. 138)
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Overproduction of antioxidants, usually thought to be beneficial, is the cause of an inherited heart disease. (p. 141)
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Strong religious beliefs or practices don't appear to benefit depressed or socially isolated heart attack survivors. (p. 141)
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Some nectar-feeding bats metabolize sugars as rapidly as hummingbirds do. (p. 141)
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Arctic snow collects less soot now than it did a century ago, but it's still dirtier than it was before the Industrial Revolution. (p. 141)
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Corn engineered to produce collagen may someday replace slaughterhouse leftovers as a source of gelatin. (p. 142)
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A photosensitive molecule makes switching off a gene as simple as flicking on a light. (p. 142)
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Making carbon nanotubes also produces a lot of airborne carcinogens. (p. 142)
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Analysis of sewage gauges community-wide use of illegal drugs. (p. 142)
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(p. 143)
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