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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
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Cyanide works by making the human body unable to use oxygen.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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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.