NATE GRANZOW SETTLES into his chair and taps a few keys on his keyboard. Two large computer screens blink to life. The left screen has a browser with so many open tabs it looks like a comb. Granzow clicks a tab, and up pops a list of 40 videos he must watch in the next hour. “Stingray scares little girl!” reads the title of one YouTube clip. It’s about a minute long, and shows two toddlers leaning over a pool, watching stingrays swim by. The boy accidentally touches one and screams with delight. Seeing this, the girl sticks her hand in the pool. When a stingray swims near, she yanks her hand back and makes a face. “Hmmm. She didn’t get scared enough for me,” Granzow says, banishing the clip with a click.

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