Tendency to 'catch' yawns doesn't occur until age five, study shows
(NEWSER) - Yawning is contagious—unless you're a baby. Children are immune to the phenomenon until the age of five, a new study shows. Dogs and chimpanzees also "catch" yawns, even from people, but human youngsters only yawn spontaneously, psychologists found after studying 22 children. They showed each videos of other children, adults, animals, and even their mothers yawning to determine the results, published in the Biological Letters journal. More»
