631. "Catching" a yawn could help us bond.

(Why do you yawn when someone else does, even if you aren't tired? There are a few theories about why yawning is contagious, but one of the leading ones is that it shows empathy. People who are less likely to show empathy—such as toddlers who haven't learned it yet or young people with autism—are also less likely to yawn in reaction to someone else's.)

632. Food tastes better when someone else makes it.

(Ever wonder why that sandwich from the takeout place down the street tastes better than the ones you make at home, even if you use the same ingredients? One study published in the journal Science found that when you make yourself a meal, you're around it so long that it feels less exciting by the time you actually dig in—and that, subsequently, decreases your enjoyment.)

633. If we share something on social media, we understand it less. (If you really care about understanding information, don’t be in a rush to share it.)

634. You’ll get more benefit by giving. (Applies to both time and money.)

635. Feeling like you’re an expert makes you close minded.