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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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The average adult has about 21 square feet of skin.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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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.