One story that's simmering at the Olympics in Rio de Janeiro has to do with sex: in particular, the controversy over intersex athletes, who are anatomically and genetically ambiguous.At issue: Is it fair to allow those athletes, who often have high levels of testosterone, to compete with women?Much of the attention has focused on South African runner Caster Semenya, the favorite to win gold in the women's 800 meters on Saturday. Semenya has been identified as intersex in many media reports, though she has never confirmed that or spoken about it.She exploded onto the world scene in 2009, when she was just 18. She destroyed the 800-meter field at the world championships in Berlin, winning with a time of 1:55:45, more than two seconds faster than her nearest competitor in the final.Hazel Clark of the U.S. ran against Semenya in the semifinal that year and missed the final by one spot."There was so much talk around her," Clark recalls. "Everybody kinda said, 'Something's not right with her
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