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Your search has returned 18 articles:
  • News

    Ancient Taint: Likely source of old dioxins identified

    The burning of peat in coastal areas of Scotland could be responsible for the enigmatic concentrations of dioxins that scientists sometimes find in pre-20th-century European soil samples.

    Dioxins are a class of more than 200 chlorine-rich organic chemicals that are highly toxic, trigger birth defects, and can cause cancer (SN: 5/15/99, p. 309). Presumed modern substances, dioxins...

    02/26/2003 - 13:33 Earth & Environment
  • News

    Jonathan Eberhart (1942–2003)

    Longtime readers will mourn the death last week of Jonathan Eberhart, following a long illness. A legend among science writers, he covered the birth and adolescence of space flight and exploration for Science News from 1960 to 1991. He was also a renowned folk-music writer and performer.

    For 3 decades within our pages, Jonathan Eberhart chronicled space science and...

    02/26/2003 - 13:16 Humans & Society
  • News

    After Invasions: Can an ant takeover change the rules?

    A rare before-and-after study of the invasion of an exotic species shows the newcomer swiftly disassembling the community, say ant biologists.

    Before Argentine ants (Linepithema humile) swept into a nature preserve in northern California, some 20 species of native ants worked the landscape in largely segregated domains, says Nathan Sanders of Humboldt State University in Arcata, Calif....

    02/26/2003 - 12:53 Ecology
  • News

    Mixed Results: AIDS vaccine falters in whites, may help blacks

    In its first large test, an AIDS vaccine has failed to shield an at-risk population from acquiring HIV, the virus that causes the disease.

    The results, released by the biotechnology company VaxGen of Brisbane, Calif., may mark a turning point in AIDS-vaccine research, says Norman Letvin of Harvard Medical School in Boston. While VaxGen should be applauded for "a landmark effort" to get...

    02/26/2003 - 12:16 Biomedicine
  • News

    Waterproof Coats: Materials repel water with simplicity, style

    Scientists have long sought new coatings that zealously repel water. This week, publications describe two promising finds. Research from Japan shows that water-repellant materials can also be decorative. In a separate report, Turkish researchers describe a way to convert a plastic into a new type of cheap, easily produced waterproofing.

    Although their final coatings are different, both...

    02/26/2003 - 11:32 Materials
  • News

    Sexual Hang-Up: Fish hormones change when oxygen is scarce

    Oxygen deprivation tampers with sex hormones in fish and impairs reproduction, according to new research. The results suggest that low oxygen in freshwater ecosystems can disrupt animals' endocrine systems. Researchers say this link might explain the ongoing decline in some fish and amphibian species.

    Various pesticides, components of plastics, and other chemical pollutants...

    02/26/2003 - 11:09 Earth & Environment
  • News

    Pieces of a Disputed Past: Fossil finds enter row over humanity's roots

    Two scientific teams have presented fossil discoveries with controversial evolutionary implications for two ancient species traditionally regarded as direct ancestors of Homo sapiens.

    A 1.8-million-year-old upper jaw discovered in eastern Africa solidifies the position of Homo habilis as the oldest known member of the Homo genus, say anthropologist Robert J....

    02/26/2003 - 10:36 Anthropology
  • News

    Stem Cell Surprise: Blood cells form liver, nerve cells

    A person's blood could someday provide replacement cells for that individual's damaged brain or liver, a provocative study suggests. Human blood contains so-called stem cells that can be transformed outside the body into a variety of cell types, according to the report. This unexpected, and accidental, discovery may add a new element to the politicized debate over whether stem cells that...

    02/26/2003 - 10:04
  • Feature

    A Safe Solution

    Ogongo, Kenya–To the crowd's delight, the dancer wiggles his hips and flails his arms. His bulky, blue costume–an oversized embodiment of a bottle of chlorine solution–lurches comically. In step with a drum-and-guitar accompaniment, other performers masquerade as a water jug and caricatures of a man and a woman. Among

    the audience are Kenyan health...

    02/26/2003 - 09:24 Earth & Environment
  • News

    Technique may yield vocal cord stand-in

    From Denver, at a meeting of the American Association for the Advancement of Science

    A plastic material used in some biological implants could someday form a foundation for tissue that can repair or replace human vocal cords, new experiments suggest.

    Developing a surrogate for the body's soft tissues can be difficult because the components often have a complex cellular structure,...

    02/25/2003 - 13:36 Materials