Facial expressions arise from brain networks that encode slow, context-rich meaning and fast muscle control on different time scales, keeping smiles and threats socially precise.

Humans not only recognize emotions on the faces of monkeys and apes but also unconsciously mimic those expressions.

Kathleen Bogart has received research funding from the National Institutes of Health and the Moebius Syndrome Foundation. She is a member of the Board of Directors of the Moebius Syndrome Foundation.

Selfies, headshots, mug shots — photos of oneself convey more these days than snapshots ever did back in the Kodak era. Most digitally minded people continually post and update pictures of themselves ...