 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 2-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 9-year-old boy who hopes a friend invites him to a sleepover, not for fun, just so he can have dinner.