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The human body produces and destroys 15 million blood cells every second.
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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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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Thyroid conditions may make getting pregnant impossible.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.