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http://www.sciencenews.org/view/issue/id/5038
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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 22nd, 2004
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Using particles accelerators to mimic the conditions inside stars, two independent research groups have found evidence that the most-ancient known stars are about a billion years older than astronomers had estimated. (p. 323)
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A research review challenges the assumption that scientists have demonstrated a causal link between teenage marijuana use and later psychological and behavioral problems. (p. 323)
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Invisible freeways of wind may account for the similarity of plant species on islands that lie thousands of kilometers apart. (p. 324)
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The most thorough DNA analysis yet of purebred dogs suggests that canine breeds can also be discerned genetically with great accuracy. (p. 324)
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Forests of semiconducting nanotrees could form the basis of future solar cells, low-energy lighting, and other optical or microelectronic devices. (p. 325)
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Virtually all of America's fresh water is tainted with low concentrations of chemical contaminants, according to a new nationwide study. (p. 325)
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The three top winners of the 2004 Intel International Science and Engineering Fair hail from high schools on different continents. (p. 326)
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New fossil finds in a Romanian cave fuel controversy over whether different, closely related species interbred on the evolutionary path that led to people. (p. 328)
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A slew of new and proposed experiments, ranging from the cosmic to the subatomic scale, may shed light on why the expansion of the universe is speeding up. (p. 330)
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In early April, an Earth-orbiting satellite closed its doors after more than 2 years of collecting ions from the solar wind. (p. 333)
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By fusing two egg cells, researchers have created a mouse with no father. (p. 333)
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Microscopic particles in the air may mutate the DNA of sperm. (p. 333)
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Some pills marketed as herbal remedies for erectile dysfunction contain drugs that should be available only by prescription. (p. 333)
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A placebo treatment temporarily quelled symptoms of Parkinson's disease in six people by decreasing the electrical activity of brain cells crucial to the condition. (p. 334)
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The next time you hear about an asteroid or comet about to hit Earth, you can go to a new Internet site to find out where the collision will be and how much damage will occur. (p. 334)
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Excavations at three archaeological sites in Guatemala have provided new insights into both the early and late stages of ancient Maya civilization. (p. 334)
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Analyses of small black chunks of material extracted from 420-million-year-old rocks found along the England-Wales border suggest that they're remnants of the earliest known wildfire. (p. 334)
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(p. 335)
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