Boston is famous for world-class hospitals and diehard sports fans. In 1948, those communities united to raise money so a young cancer patient could watch his favorite baseball team on TV. In the process, a charity was formed that more than 70 years later still raises millions of dollars each year to fight cancer in children and adults alike. The moment when Dr. Sidney Farber, his patient, Einar “Jimmy” Gustafson, the Boston Braves and a showbiz-linked charity crossed paths to initiate what would become the Jimmy Fund, is memorialized in…