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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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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").