Detailed text transcripts for TV channel - KGO - 20120823:09:07:00
Americans were smokers. if you have seen "mad men," you know that is true. in the past 12 years the number of younger smokers has fallen dramatically. a new study from the journal "nature" is shedding light on the mystery behind autism. it turns out the age of the father, it is a key factor in whether a child develops this disorder. abc's medical editor, dr. richard besser, has all the details. >> reporter: autism, one of medicine's greatest puzzles, has some new math, about older dads. dads like ray siegel. >> let's figure out if there is a genetic factor. >> reporter: his sons oscar and hu...
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