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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

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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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Thyroid conditions may make getting pregnant impossible.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

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