Strangest World Surprises You Won’t Believe Are Real

Their study, published in PLOS ONE, suggests that babies who are smiling are attempting to make whomever they're interacting with smile back — all while the infants exert as little effort as possible. "I used to wonder if my daughter was trying to communicate with me when she was an infant and smiled," the lead researcher tells the San Diego Union-Tribune, and this study shows "it might not have just been wishful thinking on my part. Babies are very goal-oriented."