willing to offer me? this is a guy who, you know, is very smart. you may think he's kind of wacky in his public statements and public persona. don't count on it. karzai's a very sharp person and usually he's got a motive behind what he's doing. >> a very calculated man, no doubt about that. of course a patient taliban waiting in the wings. >> cocaine and marijuana what nigella's husband says she did on a daily basis. how her alleged drug use could impact two assistants accused of em baso embezzlement. >> a driverless car of the future. how you could see them on the streets in not too many years. plus, a comet that's been around for more than a million years. could meet a violent death or it could provide an amazing thanksgiving sky show.