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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.