July 15th, 2000
issue

  • 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. (p. 36)
  • 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. (p. 36)
  • 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. (p. 37)
  • 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. (p. 37)
  • 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. (p. 38)
  • 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. (p. 38)
  • 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. (p. 39)
  • Lab ecosystems show signs of evolving
    An ambitious test of group selection considers whether natural selection can act on whole ecosystems as evolutionary units. (p. 39)
  • The Motion in the Ocean
    Scientists dive deep to learn how the sea circulates. (p. 42)
  • An Ounce of Prevention
    Fresh approaches may cut back greenhouse-gas emissions. (p. 45)
  • 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. (p. 40)
  • 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. (p. 40)
  • Hormone treats autoimmune disease
    A medication combining the drug prasterone and hormone dehydroepiandrosterone, or DHEA, stabilizes or improves symptoms of lupus. (p. 40)
  • Gene causes body-fat disorder
    A gene linked to a form of muscular dystrophy also causes a disease that deposits fat unevenly after puberty. (p. 40)
  • Stress and sleepless nights
    Insomnia is associated with increases in stress hormones, boosts that persist all day and night. (p. 40)
  • 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. (p. 47)
  • 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. (p. 47)
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