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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

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A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

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

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

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