Personality typing can be fun and help people feel seen. If you took half an hour to fill out an Enneagram quiz and paid for the result, you know what we're talking about. Astrology is another ...

A surprising new study — or unsurprising, depending on who you are — suggests that the middle child takes the cake when it comes to certain personality traits. There's no denying that birth order ...

Both humans and chimps grow up with siblings who differ a lot from each other. Chimpanzees are notoriously unhelpful—that is, there is very little evidence that they go out of their way to invest time ...

The question of whether siblings' birth order shapes their personality has puzzled families and psychologists for years. But ...