If there's one thing that antivaccine activists share in common, it's the passionate (and as yet unproven) belief that "something" out there in the environment caused the "autism epidemic." Usually, that "something" thought to be vaccines, but with the utter failure of the vaccine-autism hypothesis to the point where it is considered soundly refuted, antivaccinationists have gotten a bit more—shall we say?—creative. Now it's something in the environment. Sometimes it's mercury, despite the utter lack of evidence that mercury in vaccines is even remotely linked to autism. Sometimes it's…