Researchers have made a major breakthrough in predicting which parents are more likely to have a child with autism. They've discovered that cases of autism seem to occur in neighbourhood clusters where people with higher-than-average levels of education tend to live. It's already known that better-educated people are more likely to have a child with an autism spectrum disorder, and they tend to gravitate to specific neighbourhoods, as researchers discovered when they analysed various regions of California. As a result, rates of autism were twice as high as those outside of those areas, they found. (Source: Autism Research, published online, 4 January 2010; doi: 10.1002/aur.110).