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Even though there have been truly significant advances in modern medicine, health problems still abound and cause untold misery. Although heart disease and cancer were rare at the beginning of the 20th century, today these two diseases strike with increasing frequency, in spite of billions of dollars in research to combat them, and in spite of tremendous advances in diagnostic and surgical techniques. In America, one person in three suffers from allergies, one in ten has ulcers and one in five is mentally ill. Every year, a quarter of a million infants are born with a birth defect and undergo expensive surgery, or are hidden away in institutions. Other degenerative diseases such as arthritis, multiple sclerosis, diabetes, and chronic fatigue afflict a significant majority of Americans. Further learning disabilities make life miserable for seven million young people and their parents. These diseases were extremely rare only a generation or two ago. Today, chronic illness afflicts nearly half of all Americans and causes three out of four deaths in the United States.