Well, yesterday the gang of frauds and liars in the White House announced that there was a central link, and that it was acetaminophen, or Tylenol. Kennedy, a longtime anti-vaccine activist, has promoted discredited theories that vaccines cause autism. They presented no evidence for a link between autism and Tylenol, but just blithely charged in and invented one. The studies have been done to show that Tylenol is not a significant factor! Scientists compared siblings — who share genetics and other variables such as parental health, environmental exposures, and socioeconomic factors — and were able to limit the influence of other potential risk factors.