Vol. 162 No. #7
Archive Issues Modal Example

More Stories from the August 17, 2002 issue

  1. Archaeology

    Ancient birth brick emerges in Egypt

    Investigations at a 3,700-year-old Egyptian town have yielded a painted brick that was used in childbirth rituals.

  2. Health & Medicine

    Worm genes take on bacterial foes

    Creatures as simple as worms have an effective immune defense.

  3. Biological clock study challenged

    A report disputes the controversial notion that bright light applied to skin can reset a person's biological clock.

  4. Malaria parasite reveals old age

    The DNA of a malaria-causing parasite suggests it is at least 100,000 years old.

  5. Earth

    El Niño: It’s back!

    An increase in ocean temperatures in the central Pacific heralds the onset of El Niño, whose effects should show up in the United States this fall.

  6. Health & Medicine

    Toxin Trumped: New malaria vaccine protects mice

    An experimental vaccine neutralizes a toxic molecule made by malaria-causing parasites.

  7. Ecosystems

    Tougher Weeds? Borrowed gene helps wild sunflower

    Feeding concerns about developing superweeds, a test of sunflowers shows for the first time that a biologically engineered gene moving from a crop can give an advantage to wild relatives under naturalistic conditions.

  8. Materials Science

    Spinning Fine Threads: Silkworms coerced to make better silk

    The caterpillars that spin commercial silk can make tougher or more elastic threads, depending on how fast they're forced to spin.

  9. Not a Turn-On: Alleged X chromosome activator may be a dud

    A gene that helps regulate X chromosome activity in mice doesn't work in people.

  10. Earth

    Killer Cocktails: Drug mixes threaten aquatic ecosystems

    Trace amounts of pharmaceutical drugs in waterways may work together to deform and kill native microscopic organisms.

  11. Astronomy

    X-Ray Chaos: Violence shows itself in a nearby galaxy

    New X-ray observations provide additional evidence that Centaurus A, the nearest radio-wave-emitting galaxy to Earth that has a supermassive black hole, is a maelstrom of violence.

  12. Earth

    Nature’s Own: Ocean yields gases that had seemed humanmade

    Chemical analyses of seawater provide the first direct evidence that the ocean may be a significant source of certain atmospheric gases that scientists had previously assumed to be produced primarily by industrial activity.

  13. Health & Medicine

    Budding Tastes: Higher blood pressure in newborns links to salt preference

    Babies who tolerate a salty flavor have higher blood pressure on average than their less tolerant counterparts do.

  14. Math

    Logic in the Blocks

    Sliding-block puzzles can be surprisingly difficult to solve and can even serve as theoretical models of computation.

  15. Chemistry

    Tums of the Sea

    Ocean scientists question whether the seas can handle rising carbon dioxide concentrations.

  16. Chemistry

    Questions of Origin

    Two new studies renew controversy about the authenticity of a map that may be the first depiction of North America.