Vol. 158 No. #3
Archive Issues Modal Example

More Stories from the July 15, 2000 issue

  1. Ecosystems

    Ultimate Sea Weed Loose in America

    The unusually invasive strain of seaweed that has been smothering coastal areas of the Mediterranean has shown up in a California lagoon, the first sighting of this ecologically devastating alga in the Americas.

  2. Health & Medicine

    Cultured cells reverse some eye damage

    Transplants using bioengineered corneal stem cells grown on an amniotic membrane can vastly improve vision in people who are nearly blind because of damaged corneas.

  3. Materials Science

    Ancient seal technology shows its age

    Modern technologies reveal than an ancient method of engraving tough quartz in Mesopotamia was adopted some 1,500 years later than scholars had thought.

  4. Mental ills attract alternative therapies

    A substantial minority of people suffering from mental ailments seek out alternative treatments, such as herbal medicines and nutritional regimens, usually without telling their physicians.

  5. Tech

    Technique boosts data rate in light pipes

    Turning a liability into an asset, a new technique for passing information through optical fibers increases the data flow by exploiting the very trait that has long held that flow back.

  6. Possible Alzheimer’s vaccine seems safe

    A vaccine intended to slow or prevent the devastation of Alzheimer's disease appears promising, according to preliminary tests in people.

  7. Paleontology

    Was it sudden death for the Permian period?

    The massive extinctions that came at the end of the Permian period could have occurred within a mere 8,000 years, which suggests a catastrophic cause for the die-offs.

  8. Ecosystems

    Lab ecosystems show signs of evolving

    An ambitious test of group selection considers whether natural selection can act on whole ecosystems as evolutionary units.

  9. Why did the turtle cross the road?

    A survey of painted turtles that perished while trying to cross a highway suggests that the freshwater species need more dry land than expected.

  10. Predators shape river world top-down

    Hunting and no-hunting zones allow a rare test of the much-debated proposal that big carnivores shape their ecosystems from the top down.

  11. Health & Medicine

    Hormone treats autoimmune disease

    A medication combining the drug prasterone and hormone dehydroepiandrosterone, or DHEA, stabilizes or improves symptoms of lupus.

  12. Health & Medicine

    Gene causes body-fat disorder

    A gene linked to a form of muscular dystrophy also causes a disease that deposits fat unevenly after puberty.

  13. Health & Medicine

    Stress and sleepless nights

    Insomnia is associated with increases in stress hormones, boosts that persist all day and night.

  14. Physics

    Gecko toes tap intermolecular bonds

    For scurrying upside down on smooth ceilings and other gravity-defying feats, lizards known as geckos may exploit intermolecular forces between the surface and billions of tiny stalks under their toes.

  15. Physics

    New equation fits nitrogen to a T

    An elaborate, new equation that yields more accurate values for nitrogen's properties might have a multimillion-dollar impact in the cryogenic fluids industry.

  16. Earth

    The Motion in the Ocean

    Scientists dive deep to learn how the sea circulates.

  17. Earth

    An Ounce of Prevention

    Fresh approaches may cut back greenhouse-gas emissions.