A recent study finds that we tend to recognize words associated with positive thoughts faster after we've had some coffee. Christie Nicholson reports

A new study finds that diapers, both disposable and cloth, impede walking for babies. Christie Nicholson reports

Tree-ring data from A.D. 774 show a sudden spike in radioactive carbon 14, pointing to a burst of charged particles or high-energy radiation that struck Earth. A relatively nearby gamma-ray burst could be the culprit. John Matson reports

A recent study shows that images of thin women do in fact alter women's body preferences. Christie Nicholson reports

After a few false alarms, the star SN 2009ip appears to have gone supernova at last. John Matson reports

Michael C. Hall, of TV's Dexter, talks about psychopathy with psychologist Kevin Dutton, author of The Wisdom of Psychopaths

Six volunteers spent 520 days in a simulation of a trip to Mars, and wound up experiencing sleep disturbances and becoming more sedentary. John Matson reports

Opening the door to the paying public means that less healthy individuals will soon have access to space--if their doctors approve. John Matson reports

Dan Ariely is a professor of behavior economics at Duke University. His latest book, The (Honest) Truth about Dishonesty, explains how creativity makes us better liars--even to ourselves

Volunteers who spent at least four days hiking with no communications or computing technology scored higher on creativity tests upon their return than did a control group. Rose Eveleth reports