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  1. Putting Out the Welcome Mat: Chemical guides germ cells to gonads

    A chemical made in the gonads attracts the embryonic cells that will one day form eggs or sperm.

    By John Travis
  2. Health & Medicine

    Deadly Stowaways: Seeds of cancer in transplant recipients are traced back to donors

    Precancerous cells that grow into Kaposi's sarcoma are sometimes introduced into a person in an organ transplant.

    By Nathan Seppa
  3. Anthropology

    Cannibalism’s DNA Trail: Gene may signal ancient prion-disease outbreaks

    Cannibalism among prehistoric humans may have left lasting genetic marks.

    By Bruce Bower

  4. 19312

    I feel compelled to respond to this article. No one can enter and leave the wilderness without a trace, whether on foot, bike, horse, all-terrain vehicle (ATV), skis, snowmobile, or snowshoes.