Observing a Slot Machine

[The] weakness of biological balance studies has aptly been illustrated by comparison with the working of a slot machine. A penny brings forth one package of chewing gum; two pennies bring forth two. Interpreted according to the reasoning of balance physiology, the first observation is an indication of the conversion of copper into gum; the second constitutes proof.

 Children With Self-Control Do Better in Life

A healthy, well-adjusted preschooler sits down at a table in front of two giant, freshly baked chocolate chip cookies. It’s not a kitchen table—it’s Walter Mischel’s Stanford lab during the late 1960s. The smell is heavenly. “You see these cookies?” Mischel says. “You can eat just one of them right now if you want, but if you wait, you can eat both. I have to go away for five minutes. If I return and you have not eaten anything, I will let you have bothcookies. If you eat on...