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Blood is approximately twice as thick as water because of the cells and other components found in it.
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There are more bacteria in your mouth than there are people in the world.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.