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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

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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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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.

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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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