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How many of these are correct?
Great, you answered "3".
See here what other people have answered:
- 4
- 2
- 3
- 1
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Interesting fact:
If you drink about 2 liters of water a day, rest assured that your brain cells are well-hydrated. As a result, they also receive oxygen and important nutrients. You should exercise your brain as much as you exercise your body.