Why do men talk and women gossip, and which is better for you? Why is monogamy a drain on the brain? And why should you be suspicious of someone who has more th

We are the product of our evolutionary history, and this history colors our everyday livesûfrom why we joke to the depth of our religious beliefs. In How Many

'Fascinating...In essence, the number and quality of our friendships may have a bigger influence on our happiness, health and mortality risk than anything else