글의 제목으로 가장 적절한 것은? Scientists believe that crying has something to do with how humans developed and learned to depend on each other. "Humans are very complex social creatures," says Lauren Bylsma, a professor of psychiatry. "It seems that tears serve to elicit help and support from others." She says another reason we weep is that humans have the longest developmental period of almost any animal. Another psychiatrist agrees. "I think that the reason humans shed emotional tears has to do with our prolonged childhood," he says. "That's the time when we are still dependent on adults for love and protection and care. The major advantage of tears is that you can target them at a specific person." ＊psychiatry: 정신의학