California scientists have discovered clusters of autism, largely in the Los Angeles and San Francisco areas, where children are twice as likely to have autism as children in surrounding areas, says a report at Environmental Health News. Location next to pollution or some other cause of the disease doesn't look like the culprit, however. "The 10 clusters were found mostly among children with highly educated parents, leading researchers to report that they probably can be explained by better access to medical experts who diagnose the disorder," says the report.