The stock market is currently in one of its longest bull markets ever, but that doesn't hold a candle to what's going on bonds. According to Paul Schmelzing, a PhD candidate at Harvard and a visiting researcher at the Bank of England, you have to go back more than 500 years (!) to find a bull market in bonds longer than than the one we're experiencing now. After bonds tumbled since last summer (especially since the election) there's a lot of interest in whether we're on the cusp of a major downturn. In this week's Odd Lots, Schmelzing walks us through the history of bull and bear markets in bonds and explains why we could see some gigantic losses ahead.