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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.

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LOS ANGELES, CALIFORNIA - MAY 20: In this photo illustration, the OpenAI logo is reflected on the screen of a smartphone with the ChatGPT website displayed on May 20, 2026 in Los Angeles, California. OpenAI is reportedly preparing to confidentially file for an initial public offering in the coming days or weeks, with a public debut potentially targeted for September, as the ChatGPT maker works with Goldman Sachs and Morgan Stanley on what could become one of the most highly anticipated tech IPOs in recent years. (Photo Illustration by Justin Sullivan/Getty Images)
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