Imagine that you are a child again. In this version of your childhood, you arrive at school hungry, tired and anxious. Your mother was not able to pay the rent this month. The cupboards are bare. A car alarm went off late last night, and it fell to you to soothe your baby brother back to sleep. You woke up early to take the bus across town, and by the time the school bell rings, you have so much on your mind that it is difficult to concentrate.