A large new Danish study confirms that the measles, mumps and rubella vaccine does not cause autism. The study, published Monday in Annals of Internal Medicine, looked at more than 650,000 children, some who were vaccinated with the MMR vaccine, and some who were not. It concluded that the vaccine did not increase a child's risk of developing autism or trigger autism in susceptible kids. Meanwhile, the U.S. Senate Committee on Health, Education, Labor and Pensions is holding a hearing Tuesday on the rise in outbreaks of measles and other preventable diseases. We'll discuss the report and how lawmakers and California officials are addressing the issue.