las vegas and palm springs hit by an after the -- afternoon thunderstorm. and the america's cup world series gets under way and the story on the ipad app that blends video gaming with trading cards. >> thank you. >> a group says it thinks it solved a mystery of a marmat this, was cup toured in willow glon. >> the group believes it hitch aid ride under a man's car. it will be returned to the

las vegas, and palm springs. >> 80s from the rockies to the nation's midsection and east coast. 90s in, and phoenix. >>> the number of cigarette smokers has dropped, now hitting a milestone. gallup says it's the lowest it's been in nearly 70 years. just 20% of americans say they have smoked a cigarette in the past week. back in the '50s, 45% of 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 hugo are both autistic. for the first time, researchers are spelling out mathematically how the genetic material in men's sperm changes as they age. their