We all seek out stress. We hate the wrong kinds of stress but when it's the right kind, we love it - we pay good money to be stressed by a scary movie, a roller coaster ride, a challenging puzzle.

As long as experiencing your optimal level of good stress doesn't damage others, it's hard to objectively define where normal enjoyment of stimulation becomes adrenaline junkiehood.

The frontal cortex doesn't even fully develop until age 25, which is wild!

Most people who do a lot of exercise, particularly in the form of competitive athletics, have unneurotic, extraverted, optimistic personalities to begin with. (Marathon runners are exceptions to this.)

Only humans invent moralizing gods who monitor our behavior.

Give lab rats oxytocin and, according to that meme, they get better at talking about their feelings and sing like Joan Baez.

The regulation of genes is often more interesting than the genes themselves, and it's the environment that regulates genes.