When Allyson Felix took the starting blocks for her 400 meter race, she couldn't have imagined taking second like that. Though her silver medal makes her the most-decorated woman in U.S. track and field history (her seventh breaks a tie with Jackie Joyner-Kersee ), she might feel disappointed with the result. That's because she lost by a hand when Shaunae Miller of the Bahamas literally dived across the finish line to secure gold.This is about as close as any race can be.