For all the satchels of research dollars and reams of ink devoted to exercise-induced pulmonary hemorrhage (EIPH), it remains a topic Swiss cheese riddled with unknowns. Which means that, as the sport continues to move away from Lasix as a crutch to manage the problem--especially when the federal Horseracing Integrity and Safety Act (HISA) outlines a timeframe for a total race-day Lasix ban--various lines of inquiry beg pursuit. Given the sometimes rundown, poorly ventilated state of racetrack barns around the country, perhaps the most urgent one is this: How much...