A magician

A magician was boasting one day at how long he could hold his breath underwater. His record was 6 minutes. A kid that was listening said, “that’s nothing, I can stay underwater for 10 minutes using no types of equipment or air pockets!” The magician told the kid if he could do that, he’d give him $10,000. The kid did it and won the money. Can you figure out how?
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The kid filled a glass of water and held it over his head for 10 minutes.

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