Bill and Melinda Gates have committed to giving 95 percent of their wealth away. Warren Buffett - 99 percent. Forbes editor Randall Lane explains why he sees history repeating itself in the philanthropy of Gates and Buffett. 60 Minutes, the most successful broadcast in television history, kicked off its 46th season on Sept. 29, 2013. Watch Sundays at 7 p.m. ET/PT.