With all the enormous resources that are invested in medicine, it is sometimes a mystery why there is so much sickness still in evidence. Our life span, though higher than at any time in history, has now leveled off and has not significantly increased in the last two generations. There is a one-third increase in long-term illness in the last 20 years and a 44% increase in cancer incidence, which are not related to demographic issues. In some modern countries, the level of morbidity (defined as days off work because of sickness) has increased by two thirds in this time. Despite $1 trillion...