If you’re watching the Olympics, you have to marvel at the almost superhuman athleticism of it all. Simone Biles on the balance beam. Michael Phelps in the water. Usain Bolt on the track. Athletes just keep getting better and better. Or do they? Mark McClusky, the author of “Faster, Higher, Stronger,” tells Anne Strainchamps that it's not really the athletes who've gotten better. It's science and technology that have made the difference.