Distinctive New Species of Crowned Medusa Makes Experts Reevaluate Jellyfish Royalty

What Causes Athlete Burnout? A New Study Suggests Perfectionism Plays A Role

How guitar legend Joe Satriani's love of space and sci-fi inspired his new album and comics

A new study found that we could test if people have aphantasia—the inability to produce mental images—by looking at their pupil size. When asked to imagine bright and dark objects, most people's pupils dilate or constrict, but they don't in people with aphantasia.