what that leaves all of us sort of trying to basically do is limit our exposures. we don't know if we're part of those few who are more predisposed to cancer. so if we limit our exposures to those things, all of us are going to cut down on actually getting cancer. >> seems like sound advice. dr. sanjay gupta, thanks very much. >> thank you. now, the pop lead. it's the night that will awaken a new generation of "star wars" fans and finally give the older generation, including me, the answer to that 33-year-old question, what happened to luke skywalker. just a couple hours "star wars" episode 7 will hit theaters across the country. lines of geeks and movie buffs and the pop culture curious all wondering if disney and j.j. abrams can pull off the ultimate jedi mind trick and wipe out memories of jar jar binks. opening weekend projected sales