For the First Time, Sensors and a Computer Play Umpire in a Pro Baseball Game

It turns out 21st century baseball with a computer calling balls and strikes feels a lot like 20th century baseball (you know, with a human behind the plate). There appears to be two main differences. The first and most obvious is volume. Machines just aren’t good at giving that classic umpire grunt, so you still need a warm body to do it. The second? Accuracy.
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