Many of us measure our friendships by depth or quantity: Do I have enough close friends? Are they texting me back? Do they like me? But having spent the last 15 years studying happiness, I've learned ...

Friendships are critical for mental health. We know this intuitively, and studies back it up. However, what do we do when a friend is hurting? There is no perfect way to help a friend who is ...

You may feel like you can read your friend’s mind or that you can finish each other’s sentences. It’s not your imagination. There is new scientific proof that your friends influence you ...