Tonight three legends of swimming—Michael Phelps, Chad Le Clos, and László Cseh—turned in identical times to share silver in the 100m butterfly. Last night, Simone Manuel tied for gold with Canadian Penny Oleksiak in the 100m freestyle. Modern timing systems are capable of measuring down to the millionth of a second—so why doesn’t FINA, the world swimming governing body, increase its timing precis