The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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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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Everyone has one nostril that is larger than the other.
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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 ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
The Type C killer whale
An onager, one type of wild ass
The Indian palm squirrel is the most common type of squirrel found in India.
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One type of safety needle withdraws into a protective sheath when the injection is complete.