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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

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The average adult has about 21 square feet of skin.

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

Cells involved in nonspecific immunity in vertebrates. Cells involved in nonspecific immunity in vertebrates.
Our innate preferences for sugar and fat are sometimes hard to resist. Our innate preferences for sugar and fat are sometimes hard to resist.
(a) Blue arrows (right side): External components of the innate immune system: human body with skin, ... (a) Blue arrows (right side): External components of the innate immune system: human body with skin, ...
Mechanisms of active and passive immunity Mechanisms of active and passive immunity
Types of Immunity Types of Immunity
Innate Defenses Innate Defenses
Video: Lipid absorption - end products & transport mechanism

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