We talk a lot on Odd Lots about the idea of investing. But what's it like to actually have to put money to work in some of the trickiest investing environments in history? David Schawel was an equity analyst who suddenly became the manager of a portfolio of subprime mortgage bonds during the worst of the credit crunch. Now he manages fixed-income portfolios for New River Investments. We talk to him about what it was like to manage a subprime portfolio back in 2008, the differences between stocks and bonds, and how to put money to work when lots of people are talking about an overvalued market.