male or female

How can we really tell?

The story of Caster Semenya begs an answer to the above question.

Caster won the women’s 800 and 1500 metre races at the World Athletics Championship by leaving the closest competitors way behind. Is she truly female the way we have traditionally thought of that gender, or is it possible that she has a rare genetic disorder that gives her some male advantages over the others in her gender?

More details at this page.