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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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About 60% of newborn infants in the United States are jaundiced; that is, they look yellow. Kernicterus is a form of brain damage caused by excessive jaundice. When babies begin to be affected by excessive jaundice and begin to have brain damage, they become excessively lethargic.

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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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There are more nerve cells in one human brain than there are stars in the Milky Way.

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