A nationwide conversion to digital television is scheduled for Feb. 17, but President Obama has asked Congress for a delay out of concern that millions of people still aren't ready for the transition.

Until now, it was unclear how virulent the Neolithic plague was within a human population ... along with traders who traveled by horse-drawn cart. “We can’t prove that this was exactly ...

A new study Monday in the American Journal of Tropical Medicine and Hygiene found that land conversion for crops in East Africa had doubled the numbers of rodents infested with plague-carrying fleas.