Vol. 157 No. #20
Archive Issues Modal Example

More Stories from the May 13, 2000 issue

  1. Paleontology

    Fossils Hint at Who Left Africa First

    Fossil skulls found in central Asia date to 1.7 million years ago and may represent the first ancestral human species to have left Africa.

  2. Earth

    U.S. smog limit permits subtle lung damage

    Ambient concentrations of smog ozone in many regions can cause lungs to leak, potentially compromising the health of even robust people.

  3. Astronomy

    Astronomers find evidence of missing matter

    Astronomers say they've likely confirmed that half of the hydrogen gas in the universe, which had not been accounted for, resides in relatively nearby reaches of intergalactic space.

  4. Health & Medicine

    New gene-therapy techniques show potential

    Two technologies for transferring genes, one that uses mobile DNA called transposons and another that uses a weak virus, have proved successful in overcoming genetic disorders in mice.

  5. Animals

    Female owls: First to advertise good genes

    Swiss researchers find the first case of a female flashing ornaments that advertise her gene quality to choosy males.

  6. Physics

    Gravity gets measured to greater certainty

    Important but imprecisely measured, the gravitational constant, G, is given its most exact experimental value yet, while a pioneering investigation into gravity finds that extra dimensions, if they do exist, occupy spaces of less than a couple tenths of a millimeter.

  7. Another chromosome down, more to go

    Scientists from six countries have completed the sequence of human chromosome 21.

  8. Health & Medicine

    Sweet news about ginseng

    When taken before or with meals, ginseng appears to help people with diabetes control the normal rise in blood sugar that accompanies eating.

  9. Diabetes drug cures infertility and more

    A common diabetes drug helps treat obesity and cure the infertility associated with polycystic ovary disease—even in people without diabetes.

  10. Are some fats more filling?

    Substituting monounsaturated fats for polyunsaturated ones in cooking may hold hunger at bay longer.

  11. Soy, tea, and cancer benefits

    Animal studies indicate that enriching diets with soy and tea fights cancer better than adding either alone.

  12. Family success prompts tit divorces

    For the first time, researchers have shown that bird pairs are more likely to divorce after raising young than after losing a nest of offspring.

  13. Buddy power warms tent caterpillars

    Tent caterpillars get more heat and insulation than scientists had expected.

  14. Invaders can conquer Africanized bees

    Bees that can take over even an Africanized-bee colony start by conning their nursemaids into giving them royal treatment.

  15. Health & Medicine

    Bats may spread new Malaysian virus

    A Nipah virus outbreak in Malaysia may have started when bats spread disease to pigs.

  16. Health & Medicine

    A hint at a healthful effect of beer

    Beer consumption seems to boost concentrations of vitamin B6 in blood and coincides with lower concentrations of homocysteine, a risk factor for heart disease.

  17. Agriculture

    Downtown Fisheries?

    Advances may make fish farming a healthy prospect, even for inner cities.

  18. Placental Puzzle

    Do captured viral genes make human pregnancies possible?