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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
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The human body produces and destroys 15 million blood cells every second.