Who Are We?

You might be surprised by what's in charge of your body

By DAVID P. BARASH

The Caterpillar and Alice looked at each other for some time in silence: at last the Caterpillar took the hookah out of its mouth, and addressed her in a languid, sleepy voice.

'Who are YOU?' said the Caterpillar.

This was not an encouraging opening for a conversation. Alice replied,...