On a freezing Chicago afternoon in 1928, a sixteen-year-old girl sprinted flat out towards an elevated train platform, her coat flapping behind her and icy air tearing past her face. The train had already begun pulling away from the station, and to her teacher, Charles Price, a former track athlete, there was no chance she’d catch it. He’d already boarded and taken his seat when, moments later, the doors opened once again. There she was, Betty Robinson, breathless, beaming, a