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Did you know?
Thyroid conditions may make getting pregnant impossible.
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There are more bacteria in your mouth than there are people in the world.
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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 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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In 1844, Charles Goodyear obtained the first patent for a rubber condom.