Our brains are wired to notice and remember the things that are wrong. It’s a survival mechanism that helped keep our cave-dwelling ancestors safe in a world where there were many physical threats. But in today’s comparatively safe world, this biological predisposition to focus on the negative contributes to stress and unhappiness.

While we can’t change our nature, we can train our brains to be more positive. This doesn’t mean putting on a smiley face and whistling a happy tune no matter what’s going on. You don’t have to ignore reality or pretend things are wonderful even when they’re not. But just as dwelling on negative things fuels unhappiness (and plays a big role in depression and anxiety), choosing to notice, appreciate, and anticipate goodness is a powerful happiness booster.