The 10-year US Treasury yield, a seemingly mundane number, has reached its highest level in years, raising eyebrows in the investment world. Bond investors in long-term treasuries have seen their fortunes take a roller-coaster ride, with some calling it the "greatest bond bear market of all time." But what does this mean? This video by Patrick Boyle, hedge fund manager and university professor, takes you on a journey through the recent highs and lows of the bond market, helping you grasp the implications of these shifts.