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Which of these would you use to play tennis?

Fact Lab

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Interesting fact:

The best-known geniuses in history slept between 2-4 hours a day, so if you sleep for a few hours you may be a genius! You should take advantage of the early morning and go to bed early! It is advisable to sleep 8 hours each night, if you sleep less, you will need a rest throughout the day.

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