Americans are very good at keeping statistics. As people get older, they are more likely to develop heart problems. Some people have heart attacks when they are about 70. But these days, people are developing heart disease at younger and younger ages. Two doctors did some research on heart disease in the 1980s, studying 9,000 people.
Cancer is a disease that still needs a lot of study.
At the Johns Hopkins Cancer Research Center, several professors are trying to discover ways to cure cancer using mental and psychological treatment. They divided their patients into two groups. Among Group A patients, the number of cancer cells decreased each month, while in group B, the number of cancer cells continued to grow. So, living for the sake of others can even help to cure disease. One woman found that if she got up one hour earlier every day for one month and picked up the garbage in her neighborhood, all her emotional problems faded away.