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MLB's 'robot umpires' have officially arrived. Here's how they work

For the first time, Major League Baseball will be using "robot umpires" or the Automated Ball-Strike System (ABS) in official league games this season, allowing players to challenge balls and strikes. CNN's Hannah Keyser explains how the new challenge system works.

1:47 • Source: CNN
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<p>A new CNN Original Series <em>“Kara Swisher Wants to Live Forever” </em>examines the science, business, and ideology behind the pursuit of longer life.</p><p> </p><p>In this digital exclusive, Swisher discusses her experience with medically supervised ketamine. Watch the next episode of the series Saturday, May 16 at 9pm and 10pm ET on CNN, and stream full episodes on the CNN app.</p>
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