She noted, many young people are especially risk averse at school—afraid that one low test score or mediocre grade could cost them a spot at a selective university.

Yet, she noted, many young people are especially unwilling to take risks at school afraid that one low test score or poor grade could cost them a spot at a selective university.

The strangers were good at judging if the person they were looking at was tired, and, if they were sleepy, their attractiveness score was low.