Finally, at different points in its stride, a galloping horse puts all its weight on a single leg. That limb bears three times more weight than usual when galloping on a straightaway and, thanks to centrifugal force, a load five to 10 times greater on turns. This translates to skeletal microdamage. Race a horse during that critical period and you increase the risk of serious injuries mid-race. Two weeks ago, vets were forced to euthanize the promising gray thoroughbred filly, Eight Belles, when she collapsed on the track after completing the race at Churchill Downs, suffering from two shattered ankles in her front legs. A fresh horse won't face any of those problems. Even a horse that ran in the Derby but skipped the Preakness will have five weeks to rest, and plenty of time for normal skeletal damage to repair, before the Belmont. "So, American Pharoah, it'd be awesome if you win the Triple Crown, but you probably won't," concluded Pandell. "It's not your fault. It's science and those pesky fresh horses." Science was wrong.