The definition of insanity, some smart person once said, is doing the same thing over and over and expecting different results. In a twist on that aphorism, Kaleb Dempsey, laboratory manager of the Racing Surfaces Testing Laboratory (RSTL), explained one recent afternoon how part of the problem with the way racetracks maintain their surfaces is that, by virtue of their tools, they have been restricted to doing the same things over and over and expecting the same kind of results. Which is where a new bespoke piece of equipment, currently...