Yale researchers asked 65 people, who ranged in age from 12 to 50, to make some decisions in a fake lottery, each with different degrees of risk. Sometimes their odds of winning were clear, but sometimes they were ambiguous, so the participants couldn't be sure how likely they were to win. When the risk was precisely stated, adolescents were just as likely to avoid them as anyone. But when risks were unclear, they were more OK with them than other age groups. Ifat Levy, assistant professor in comparative medicine and neurobiology at Yale, said this makes sense because "Young organisms need to be open to the unknown in order to gain information about their world."