Vol. 160 No. #4
Archive Issues Modal Example

More Stories from the July 28, 2001 issue

  1. Astronomy

    Bow-wowing them with radar

    The sharpest radar image ever of an asteroid shows features on 1999 KW4 as small as 7.5 meters—about the length of a stretch limo.

  2. Tech

    Biotechnology may fortify U.S. Army

    A government-sponsored study says the U.S. Army may benefit from advances in biotechnology during the next 25 years, including sensors that identify soldiers by the food they ate, protein-based computers, near-instant vaccines, and automated wound treatments.

  3. Tech

    Having gathered moss, water drops roll

    A coating of water-repellent powder transforms water droplets into remarkably mobile and resiliant balls, hoops, or peanut-shaped blobs.

  4. New Antibiotics Take Poke at Bacteria

    Small rings of amino acids can self-assemble into tubes that punch holes in bacteria.

  5. Tech

    Setting electronics in artificial stone

    Electronics components made of Portland cement may one day be part of buildngs and roadways that double as gargantuan sensors or other current-carrying devices.

  6. Planetary Science

    Craft tracks giant dust storm on Mars

    The largest dust storm observed on Mars in 25 years is now engulfing the Red Planet.

  7. Bacteria live inside bacteria in mealybug

    In a new twist on how life forms can exploit each other and with implications for how complex cells originated, scientists have discovered one bacterium living inside another.

  8. Health & Medicine

    Synthetic protein may yield malaria vaccine

    A molecule patterned after part of the parasite that causes most severe malaria induces a strong immune response in people.

  9. Deaf kids establish own sign language

    Deaf children in Nicaragua display evidence of having created a fully grammatical sign language on their own in under 2 decades.

  10. Earth

    Climate accord reached

    Negotiators, without U.S. representatives' input, resolved controversies in Bonn that were blocking an international treaty to limit greenhouse gases.

  11. Paleontology

    For past climate clues, ask a stalag-mite

    Mites fossilized in cave formations in the American Southwest show that at times during the past 3,200 years the climate there was much wetter and cooler.

  12. Animals

    Don’t look now, but is that dog laughing?

    Researchers have identified a particular exhalation that dogs make while playing as a possible counterpart to a human laugh.

  13. Astronomy

    A Rocky Bicentennial

    Mounting evidence that many asteroids aren't solid rock but collections of loosely bound fragments could have far-reaching implications for elucidating their internal structure, understanding planet formation, and developing strategies to mitigate the threat of one striking Earth.

  14. Health & Medicine

    Fighting Herself

    Autoimmune diseases are more common in women than in men, and researchers are beginning to tease out the cellular mechanisms that may be responsible for this phenomenon.