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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 -
Health & MedicineDeadly 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 -
AnthropologyCannibalism’s DNA Trail: Gene may signal ancient prion-disease outbreaks
Cannibalism among prehistoric humans may have left lasting genetic marks.
By Bruce Bower -
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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.