Tear researcher, Will Fred, is trying to figure out how it happens. One possibility he says is that tears discharge certain chemicals from your body, chemicals that build up during stress. When people talk about crying it out, "I think that actually might be what they are doing," he says. If Fred is right, what do you think will happen to people who restrain their tears? Boys, for example, cry only about a quarter as often as girls once they reach teenage years, and we all cry a lot less now than we did as babies. Could it possibly be that we face less stress? Maybe we found another way to deal with it, or maybe we just feel embarrassed.