Vol. 163 No. #15
Archive Issues Modal Example

More Stories from the April 12, 2003 issue

  1. Health & Medicine

    Microbicide thwarts AIDS virus in monkey test

    A microbicidal gel applied vaginally prevents some transmission of the AIDS virus in monkeys.

  2. Earth

    Mapping watersheds invites comparisons

    Computerized maps of environmental features for 154 of the largest river watersheds will soon be available to the public, free of charge.

  3. Astronomy

    All-sky survey makes Internet debut

    An atlas of some 5 million images from the Two Micron All-Sky Survey is now available online.

  4. Health & Medicine

    Weight-loss pill carries risks

    The drug ephedra and its presumed active ingredient, ephedrine, provide only modest weight-loss effects and pose health risks.

  5. Chemistry

    Catnip repels pest

    Known to repel cockroaches and mosquitoes, catnip oil also works against termites.

  6. Chemistry

    Nuclear-waste monitoring gets close to the source

    A new prototype device may make monitoring of radioactive contamination cheaper and easier.

  7. Chemistry

    Matcha green tea packs the antioxidants

    A green tea used in Japanese tea ceremonies contains much more of a beneficial antioxidant than ordinary green tea.

  8. Chemistry

    Contacts could dispense drugs

    Novel contact lens materials use nanoparticles to dispense drugs.

  9. Physics

    Rare Events: Exotic processes probe the heart of matter

    Physicists have for the first time unambiguously detected and measured the rates of certain reactions among protons, neutrons, and simple atomic nuclei.

  10. Astronomy

    Once Upon a Time in the Cosmos: Using distant galaxies to study the early universe

    Peering far back in time, two teams of astronomers report that they have found some of the universe's earliest galaxies.

  11. Animals

    Costly Sexiness: All that flash puts birds at extra risk

    Distinctive his-and-her plumages increase the chance that a bird species will go extinct locally, according to an unusually far-ranging study.

  12. Ecosystems

    At a Snail’s Place: Rock climbing cuts mollusk diversity

    As rock climbing soars in popularity, some cliff-side snail populations may be crashing.

  13. Anthropology

    Cannibalism’s DNA Trail: Gene may signal ancient prion-disease outbreaks

    Cannibalism among prehistoric humans may have left lasting genetic marks.

  14. Health & Medicine

    Deadly Stowaways: Seeds of cancer in transplant recipients are traced back to donors

    Precancerous cells that grow into Kaposi's sarcoma are sometimes introduced into a person in an organ transplant.

  15. Putting Out the Welcome Mat: Chemical guides germ cells to gonads

    A chemical made in the gonads attracts the embryonic cells that will one day form eggs or sperm.

  16. Tech

    Liberty’s smooth move

    Sensors clamped to the Liberty Bell's crack show that it could handle the stress of a move.

  17. Ecosystems

    Cultivating Weeds

    Some formerly mild-mannered plants turn into horticultural bullies when planted far outside their native range.

  18. Anthropology

    The Stone Masters

    Investigations of modern-day expert and novice craftsmen of stone tools and decorative stone beads offer insights into the making of stone implements thousands and perhaps even millions of years ago.