Eurasia’s genetic landscape unraveled

The largest genetic study of Eurasia's human past shows how past migrations shaped the peoples and languages of today. More »

Stem cell therapy: When will it help the heart?

Heart muscle is never replaced if it dies in a heart attack. Muscle cells grown from stem cells can briefly help broken hearts. Could More »

Are we affecting the character of future generations by the way we choose mates? If choosing attractive mates tends to make the More »

Earth’s orbit subtly changes over thousands of years, in complex cycles that affect the timing and delivery of sunlight to various More »

People have been controlling fermentation for at least 9,000 years. What did the ancients brew? How did fermenting change society? More »

Fraud happens. In a 2009 survey, 2 percent of scientists admitted faking data; 14 percent said colleagues have done it. Problems worst More »

A stone tool discovered in Polynesia came from Hawaii — 2500 miles away. Whoa! More »

Obama: “…promoting science isn’t just about providing resources—it’s about protecting free and open inquiry. More »

Did red rain in India carry alien bacteria? One Indian scientist thinks so. Others say it was just spores of a common alga. More »

People pray for the health of friends and family. Can science prove these prayers work? Should it try? More »

Bush proposes mission to moon and Mars, but how great are the scientific payoffs of this expensive, risky adventure? More »

This Why File surveys the latest in forensic anthropology and a visit with a Forensic Anthropology Center in Tennessee. More »

Nobel Prize for Medicine or Physiology given to inventors of MRI machine — but were these guys really the inventors? More »

Edward Teller helped invent the hydrogen bomb, then pushed missile defense. He changed the 20th century. More »

Will terrorists use biological weapons? How have bio-weapons been used in the past? More »