The secret of happiness is variety, but the secret of variety, like the secret of all spices, is knowing when to use it.

Humans react to danger when it is immediate, immoral, visible... Global warming does not press any of those buttons.

We humans can look deep into future and predict what will happen, but then turn around and do nothing about it.

Variety improves the things that we do too often, but it rules the things that we don't do often enough.

Global warming is a deadly threat precisely because it fails to trip the brain's alarm, leaving us soundly asleep in a burning bed.

Arthritic toothless people who love orgasms are more likely to reproduce than are limber, toothy people who do not.

Your mistake was not in imagining things you could not know—that is, after all, what imagination is for. Rather, your mistake was in unthinkingly treating what you imagined as though it were an accurate representation of the facts.