 By their clothes, their age, the way they speak. Would you recognize a 13-year-old boy who gets into fights at school? Not because he's a boy, but because he's hungry. Or a two-year-old girl who cries all night. Not because she's sick, but because she went to bed without enough to eat. Or maybe a nine-year-old boy who hopes a friend invites him to a sleepover. Not for fun, just so he can have dinner.