Vol. 161 No. #8
Archive Issues Modal Example

More Stories from the February 23, 2002 issue

  1. Infants emerge as picky imitators

    By the age of 14 months, babies display a feel for evaluating the sensibility of an adult's behavior and either imitating the means to a goal or opting for a simpler way to achieve the same result.

  2. Planetary Science

    Galileo at Jupiter: The goodbye tour

    After more than 6 years spent touring Jupiter and its four largest moons, the Galileo spacecraft’s mission is beginning to wind down.

  3. Paleontology

    Dinosaur tracks show walking and running

    A single trail of dinosaur footprints found in a British limestone quarry preserves a record of two different walking styles in the same animal, a tantalizing clue that some types of lumbering, bipedal dinosaurs could also run if the need arose.

  4. Earth

    Shuttle yields detailed, 3-D atlas

    NASA scientists and Defense Department mapmakers are assembling billions of radar measurements made from the space shuttle Endeavour to produce what they say will be the world’s best topographic map.

  5. Physics

    A new way to stick it to flies

    Researchers have measured the amount of static charge that a walking house fly generates.

  6. Health & Medicine

    Indoor tanning ups all skin cancer rates

    Artificial sunbathing using ultraviolet lights increases the risk of all types of skin cancer.

  7. Health & Medicine

    Chill Out: Mild hypothermia aids heart attack recovery

    Icing down patients who have just had a heart stoppage may boost their survival chances and prevent brain damage in those who pull through.

  8. Tech

    Beam Team: Unusual laser emits a band of light

    A novel laser on a microchip emits a band of light rather than the single, pure color usually expected from a laser.

  9. Health & Medicine

    Suspicious DNA: Chromosome study homes in on Alzheimer’s disease

    Several human chromosomes now face intensified scrutiny for possibly harboring genes involved in Alzheimer's disease.

  10. Archaeology

    Almond Joy, Stone Age Style: Our ancestors had a bash eating wild nuts

    New finds at a 780,000-year-old Israeli site indicate that its ancient residents used stone tools to crack open a variety of hard-shelled nuts that were gathered as a dietary staple.

  11. Humans

    And Counting . . . : Latest census resets U.S. population clock

    The 2000 census missed a little more than 1 percent of the nation’s population, due in part to a surge of undocumented immigrants to the United States in the late 1990s.

  12. Ecosystems

    Cryptic Invasion: Native reeds harbor aggressive alien

    A mild-mannered reed native to the United States is getting blamed for the mayhem caused by an evil twin.

  13. Health & Medicine

    Vaccine Power: Immune cells target cancerous tissue

    Researchers are enlisting a person's own immune system to attack prostate tissue, including cancerous cells.

  14. Astronomy

    The Milky Way’s Middle

    Sensitive X-ray, infrared, and radio telescopes are now providing an extraordinarily clear view of the dust-shrouded center of our galaxy.

  15. Materials Science

    Materials Take Wing

    Materials scientists are finding new uses for the billions of pounds of feathers produced each year by the poultry industry.