Hope you don't mind a new guy adding his voice, but for somepeople I don't think any explination will be good enough. As has been pointed out before human being have gotten faster over time (faster 100M, under 4:00 miles). So what must be causing this? According to too many people it must be drugs. Not evolution, training, nutrition or just people with better genetics. At the same time not all people are faster (walk down the street and tell me how many 4:00 milers you see) but a small superior group of individuals can. Why can this not be in horse racing? Why can't Ghostzapper and Smarty Jones simply be faster than the rest of the population. When will it be okay for a horse to be extremely fast. I mean Smarty Jones was being treated for a broken skull...do you really think they were druging him to make faster?