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ARLINGTON — Sai Abhideep Pundla has been awake since 3 a.m. After a red-eyed flight from Las Vegas, where he briefed data center company executives and local government officials about the future of artificial intelligence, he’s back in a lab at UT-Arlington, tinkering with a prototype he thinks could solve one of the industry’s biggest challenges: how to keep data centers cool without draining finite water supplies.