Sperm Changes News Today

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. abcs medical editor, dr. richard besser, has all the details. >> reporter: autism, one of medicines greatest puzzles, has some new math, about older dads. dads lik...