If you want to change a habit, …don’t try and change everything at once. Instead, figure out what the cue is, figure out what the reward is and find a new behavior that is triggered by that cue and delivers that same reward.

If biology is the measure of all things, then many of the categories we use to group ourselves into kinds of person — man, woman, gay, straight, black, white, professor, cheerleader — are, in fact, unreal.