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Scientists say a freezer malfunction at a Boston-area hospital has damaged one-third of the world's largest collection of autism brain samples.
Experts have blamed most of the risk for autism on inherited genes. Now one of the largest studies of twins and autism shifts the focus to the womb. It suggests that the mother's age and health may play a larger role than was thought.
As many as one in every 166 children in this country is diagnosed with autism, but medical researchers still know little about its cause. As the number of autism cases continues to rise, doctors still don't know why.