Most American diets, even bad ones, provide more than enough calcium for bone health, especially for men.

Happiness is a skill. It requires effort and time.

Meditation while walking has a long, noble history in ancient spiritual disciplines.

To be clear, I worry as much about the impact of the Internet as anyone else. I worry about shortening attention spans, the physical cost of sedentary "surfing" and the potential for coarsening discourse as millions of web pages compete for attention by appealing to our base instincts.

The bottom line is that the human body is complex and subtle, and oversimplifying - as common sense sometimes impels us to do - can be hazardous to your health.

Your body can heal itself. It can do so because it has a healing system. If you are in good health, you will want to know about this system, because it is what keeps you in good health and because you can enhance that condition. If you or people you love are sick, you will want to know about this system, because it is the best hope for recovery.

The more people have, the less content they seem to be. In America, the cultural expectation that we're to be happy all the time and our children are to be happy all the time is toxic, and I think that really gets in the way of emotional well-being.