It seems that great artists and scientists often suffer from mental problems. Both Einstein and Dickens had mental illness. Now scientists have started to look at whether mental illness and genius are linked . Dr. Adele Juda studied 5,000 creative people in Germany. She found there were more people with mental illness in this group than in the general population. Poets had the highest rate  of mental illness, followed by musicians, with lower numbers for painters and architects. Other scientists did research which also showed a strong link between mental problems and creativity. But, it did nothing to explain it. Dr. Ruth Richards of Harvard University _ . Instead of studying creative people, she took a group of psychiatric  patients and tested them for creativity. The patients got much higher scores than a normal group. Also, the patients' close relatives were much more creative than the patients and a normal group. This suggests that the key to the link between creativity and mental illness is in our genes . But this is a problem. According to Darwinism, harmful genes should be removed. Some scientists believe that evolution  has created a balance, where the madness of a few people leads to the development of the whole human race. Geniuses may be mad, bad or just difficult to understand, but their discoveries have improved the world we live in. It seems that a little creative madness is good for us all. According to Dr. Adele Juda, which of the following group has the lowest rate of mental illness?
Painters. Musicians. Poets. Bus drivers.