...the Most Controversial Race at the Olympics

The women’s 800-meter competition will be one of the most eagerly anticipated events at the Rio Olympics, and not just because the racers are fast. Some are also biologically different, at least to some degree. In earlier Olympics, they might have been disqualified, or even accused of being men. That won't happen in Rio. But the whole world will be looking very closely at South Africa's Caster Semenya (on LF) and her closest competitors.