I think the biggest issue is that men historically have had...

I think the biggest issue is that men historically have had opportunities to start developing competitive skills at a very young age, whereas most women didn't. So a lot of women athletes missed out on the opportunity to work out all those complex emotions that happen in fierce competition. Rather than genetic differences, I've found that the real differences go away when males and females have equal competitive experiences beginning at a young age. That's happening more in our culture, and no question the top women athletes of the future are going to be just as tough and focused as the top men.