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http://www.sciencenews.org/view/issue/id/3616
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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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Human blood contains stem cells that can be transformed outside the body into a variety of cell types, suggesting that a person's blood could someday provide replacement cells for that individual's damaged brain or kidney. (p. 131)
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Two new fossil discoveries have fueled scientific debates about the evolutionary status of a pair of species traditionally considered to have been our direct ancestors, Homo habilis and Homo erectus. (p. 131)
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Oxygen deprivation—an escalating problem in freshwater ecosystems worldwide—tampers with sex hormones in carp and might underlie the decline in some fish and amphibian species. (p. 132)
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Researchers have produced new types of water-repelling surfaces, including one that's colorful and another made of inexpensive plastic. (p. 132)
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In its first large test, an AIDS vaccine has failed to shield an at-risk population from acquiring AIDS. (p. 133)
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Lab experiments show that the burning of peat from coastal areas of Scotland could be responsible for the enigmatic concentrations of dioxins sometimes found in pre-20th-century soils. (p. 134)
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A rare before-and-after study of a takeover by an invasive ant species shows the interloper quickly disassembling the basic rules of the invaded community. (p. 134)
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After chronicling space science and exploration for 3 decades on behalf of Science News, Jonathan Eberhart died last week from complications of multiple sclerosis. (p. 134)
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A home-based technique for treating microbe-contaminated water with chlorine solution could save millions of lives in countries that are currently unable to provide residents with safe drinking water. (p. 136)
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Some galaxies were in place and forming stars at a prolific rate when the universe, now 13.7 billion years old, was just an 800-million-year-old whippersnapper. (p. 139)
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Silk cocoons could become puffs of valuable human proteins if a new bioengineering method pans out. (p. 141)
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Scientists have developed a synthetic antioxidant that won't, at high doses, foster the tissue damage the compounds are meant to prevent. (p. 141)
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The ceramic titanium silicon carbide can fully recover after being compressed to a degree that would leave most ceramics shattered and most metals permanently deformed. (p. 141)
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Dolly, the first clone of an adult mammal, has been euthanized after acquiring a severe lung infection. (p. 141)
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Using strips of synthetic RNA that interfere with normal gene action, scientists working with mice have stopped the progression of hepatitis. (p. 142)
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HIV-positive women who receive the drug nevirapine during pregnancy often have HIV that is resistant to the drug in their breast milk after they give birth. (p. 142)
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Men with exceptionally sensitive powers of taste may face extra health risks, such as colon cancer. (p. 142)
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A plastic material used in some biological implants could someday form a foundation for tissue that can repair or replace human vocal cords. (p. 142)
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