robert redford about a ballplayer, a phenomenal and seemingly completely natural talent. whether nature or nurture is the source of a superstar's talent is something science has been looking into. our "sunday morning's" susan spencer"48 hours." >> reporter: in 2010 at age 30, then-photographer dan mclaughlin made an amazing announcement. >> i'm going to quit my job in january and i'm going to be a professional golfer and people are like, we didn't even know you golfed. i'm like, i haven't golfed yet. (laughter) but i'm going to start in january. >> reporter: his goal, the same as tiger woods and phil mickelson's, to compete on golf's pro tour. >> the basic idea is that there is no inborn innate talent, that pe kind their own abilities through deliberate practice. >> reporter: and so he practices six days a week, six hours a day. he is halfway to his target of 10,000 hours, the time an influential study claims is required for true expertise. but even his coach has doubts. what do you think his odds are? >> it's small. (laughter) it's small for anybody. well, it's small for anybody. you got a better chance of being a surgeon or a -- you know, statistically. >> reporter: whether or not he makes the tour, dan's experi