An interesting tidbit I came across this morning from Michael Moore's blog post:

"Driving though Chicago one night he (Roger Ebert) told me the story of why and how he thinks he got it. He told me that back in the early '50s, a Chicago hospital decided to try to cure children's colds or other simple ailments by blasting them with radiation. He believed that is what set off the chain of events that would eventually debilitate him with this disease. He said that many of the other kids like him who were in the program had also contracted cancer. It was a sad story."