First, the facts, bare and unvarnished: In 2017, 17% of the 37,483 flat races in the United States were on turf, up from 5% of 71,454 races in 1991. I wrote about this shift to turf and its relationship to the breeding industry here in March. At face value, this is a significant increase, but it's bigger than I thought, because turf racing at some of the most prestigious race meets is even more impactful when filtered for quality. After removing claiming races from totals and using only races with...