Clogged arteries may have little to do with today's high-fat diets or couch potato habits: ancient hunter-gatherers had the same problem too.
Scientists believe they've found evidence for life on Mars - in data collected 36 years ago.
In what he could represent an important step toward curing HIV, a USC scientist has created a virus that hunts down HIV-infected cells.
Bill Nye, known by millions as "Bill Nye the Science Guy" for his award-winning PBS series of the same name, fainted in front of an audience at the University of Southern California, but managed to get back up if a bit dazed.
Some bacteria grow electrical hair that lets them link up in big biological circuits, possibly communicating and sharing energy.