In 1967, though there were no official rules banning women from competing in the Boston Marathon, race director Jock Semple tried to rip 20-year-old Kathrine Switzer’s bib off her mid-race. Registering without suspicion by using only her first two initials and last name, Switzer (after the ambush) finished the marathon in just over four hours. This week, 50 years later, Switzer participated in the marathon again. (In 1972 women were officially allowed to register for the race.) Read an interview with her at the Boston Globe.