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On average, the stomach produces 2 L of hydrochloric acid per day.

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There are more sensory neurons in the tongue than in any other part of the body.

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Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.

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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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