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Earlier this summer, 20,000 people gathered at the largest human resources conference in the country. The Orlando event was a blowout: Christina Aguilera performed a full-length concert, Oprah Winfrey gave the keynote address, and Disney’s Hollywood Studios theme park closed its doors to outside guests for one night to become a “private playground” for swarms of HR professionals. And yet, all it took to sour the mood was the mention of artificial intelligence. Illustration: Kati Szilagyi for Bloomberg Businessweek