The number of children born with autism is skyrocketing. Now new evidence links the role of genetics to autism. Mark Daly, director of Harvard’s Program in Medical and Population Genetics, has found a genetic mutation that significantly contributes to the disorder. And Irva Hertz-Picciotto, the principal investigator at the center for Childhood Autism Risks from Genetics and the Environment at UC Davis, surveys possible environmental factors. Daly and Hertz-Picciotto speak with host Bruce Gellerman.