What is ABS and how it works

In baseball, calling balls and strikes is a kind of art form. Now, a little more science is being added to the artistry. Major League Baseball has introduced the automated ball-strike, or ABS, challenge system. If a batter, catcher, or pitcher disagrees with the human umpire's call, he can tap his hat. Then, the ABS system uses cameras to say whether the pitch was indeed in the batter's strike zone. Marketplace’s Stephanie Hughes spoke with Nola Agha, professor of sports management at the University of San Francisco, to learn more.