"Why is a child born in northwest Los Angeles four times as likely to be diagnosed with autism as a child born elsewhere in California?

Medical experts have pondered for years why autism rates have soared nationwide, and why the disorder appears to be much more prevalent in certain communities than in others. Now, some recent studies that zero in on California may shed some light on these baffling questions. "

Melinda Beck reports for the Wall St. Journal February 1, 2010. [2]