I watch Rufus, a friend’s dog, chew enthusiastically on a rubber bone. I know the dog is alive, and his toy is not. I know that intuitively. But can I prove it scientifically? Can science parse the ...

What is a good life, and how can we create it? Forty-plus years of research has pointed to two answers. The first says that a good life is a happy life, one created by pursuing comfort, satisfaction ...