Vol. 157 No. #16
Archive Issues Modal Example

More Stories from the April 15, 2000 issue

  1. Archaeology

    Early New World Settlers Rise in East

    New evidence supports the view that people occupied a site in coastal Virginia at least 15,000 years ago.

  2. Colossal study shows amphibian woes

    The largest amphibian data set ever crunched—936 populations in 37 countries—confirms global declines.

  3. Health & Medicine

    Panel ups RDAs for some antioxidants

    An Institute of Medicine panel reported that dietary antioxidants such as vitamins A and E can limit cellular damage from free radicals but warned that studies in people have never adequately established a direct connection between antioxidant consumption and prevention of chronic disease.

  4. Astronomy

    Are solar eruptions triggered a loopy way?

    Astronomers have identified a new solar mechanism that may explain some coronal mass ejections.

  5. Trashed proteins may help immune system

    Up to 30 percent of a cell's proteins get recycled as soon as they roll off the cellular assembly line.

  6. Earth

    It’s high tide for ice age climate change

    Tides may sometimes be strong enough to tug Earth into an ice age.

  7. Ecosystems

    New protection for much-dogged shark

    To rebuild northeastern U.S. populations of the spiny dogfish, the first fishing quotas on this species limit the harvest to roughly 10 percent of the 1998 haul.

  8. Tech

    DNA embrace might drive micromachines

    DNA interactions that bend tiny diving boards, or cantilevers, may open the door to powering micromachines by means of molecular reactions.

  9. Health & Medicine

    Silencing the BRCA1 gene spells trouble

    Some breast cancer patients without a mutation in the BRCA1 gene nevertheless have an incapacitated gene, silenced by a process called hypermethylation of nearby DNA.

  10. Chemistry

    The power of caffeine and pale tea

    The relatively rare brew known as white tea offers more caffeine than green tea—and perhaps more anticancer activity.

  11. Earth

    A deadly threat in undeployed airbags

    The extremely toxic and reactive chemical used to inflate airbags could cause risks to human health and wildlife if accidentally released into the environment.

  12. Chemistry

    Unsung benefits of darker, tasty oils

    Processing to erase the distinctive flavors and colors in cooking oils also removes or deactivates compounds that can defuse biologically damaging chemical reactions in the body.

  13. Chemistry

    Nutty and fungi-ble taxol sources

    The active ingredient in the anticancer drug taxol has turned up in hazelnuts and fungi.

  14. Chemistry

    Coming up roses in scent research

    Aroma chemists have discovered a carotenoid-processing enzyme that makes the chemicals that give rose oil its smell.

  15. Chemistry

    Birth control for male cockroaches

    Scientists have discovered a gene in German cockroaches that may lead to a new type of insect control—contraception for male cockroaches.

  16. Chemistry

    Sweet tooth is in the genes

    Taste researchers have narrowed the search for the sweet tooth gene, at least in mice, to a 100-gene region.

  17. Physics

    Four ions mingle in quantum chorus

    A new way to produce mysterious quantum correlations among particles ups the record to four particles linked, or entangled, and opens the door to correlating many more particles on cue, a prerequisite for making quantum computers.

  18. Physics

    Prize honors physicist with conscience

    Physicist-author Freeman J. Dyson received the Templeton prize for originality in advancing religious understanding.

  19. Animals

    Music without Borders

    When birds trill and whales woo-oo, we call it singing. Are we serious?

  20. Health & Medicine

    Taking a Break

    Can interrupting their treatment benefit HIV-infected people?