they've been making all this money over the years. >> reporter: warren is worth about 50 billion, charlie is not far behind at all. they did it by doing everything right here in omaha. jon: that's right. thank you, liz. >> maybe we can pick up some tips. jon: a lot of people are. >> let's talk about something serious now, tracking al-qaida right now, two years after the death of osama bin laden. there seems to be something of sort of a terror revival going on with the al-qaida network evolving into a centralized movement, in northern africa, nigeria. while al-qaida lost a key haven in afghanistan it got full-fledged support from pakistan, yemen, somalia and other places. joining us to talk about this is frederick kagan the direct he shall of the american enterprise institute critical threats project. you've been looking at how al-qaida has moved around.