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There are more nerve cells in one human brain than there are stars in the Milky Way.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.