It's not hard to see why economics is called "the dismal science" – after we were blind-sided by the worst financial meltdown in decades. But economics does have its visionaries - like Nobel Prize winner Paul Krugman and fellow Nobel laureate Muhammad Yunus, who's started a new kind of bank that lends money to the very poor. Then there's Jeffrey Sachs, who's working to build a sustainable future in developing countries. And for some hands-on economic lessons in Afghanistan, meet "Three Cups of Tea" author Greg Mortensen.
Greg Mortensen is the author of "Three Cups of Tea." The book explains how a failed attempt to climb K2 led to a program to build schools in the heart of Taliban country in Pakistan and Afghanistan with local people and donated money.