The world is not ending today. Find out why in this Science Update encore presentation.
SCIENCE OF SOUND: Male penguins attract females by the sound of their voice, tropical wrens sing duets, and there's a new screening test for autism that analyzes speech patterns. Also: exposing "facilitated communication".
*Image originally appeared in: https://dx.doi.org/10.1371/journal.pbio.0020406
THE BRAIN: Empathy and aggression share the same neural circuitry, chronic pain sufferers process acute pain differently, how a brain implant made of silk could help epilepsy patients, the effects of pre-natal air pollution exposure on children's cognitive performance, and the psychology behind the Ouija board.