We replay sections from the original "Giant Pool of Money," in which This American Life producer Alex Blumberg teams up with NPR's Adam Davidson to tell the story of how the U.S. got itself into a housing crisis. They talk to people who were actually working in the housing, banking, finance and mortgage industries, about what they thought during the boom times, and why the bust happened.

Reporter Chris Arnold visits a foreclosure prevention event to find out the painful truth about the mortgage crisis: 90% of foreclosures are being enforced by servicing companies not because it helps the banks to foreclose, and not because home owners aren't interested in renegotiating their loan terms, but because there's just no system in place to handle the sheer volume of loans that need help.