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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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The average office desk has 400 times more bacteria on it than a toilet.
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The human body produces and destroys 15 million blood cells every second.
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The horizontal fraction bar was introduced by the Arabs.
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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).