In February of 1966, Bobbi Gibb (above) received a letter in her mailbox from the organizers of the Boston Marathon. She expected to find her competition number inside the package. Instead she found herself reading a disqualifying letter. It stated that women are “not physiologically able to run a marathon.” The Amateur Athletics Union prohibited women from running farther than 1.5 miles, and the organizers just couldn’t “take the liability” of having her compete.