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The familiar sounds of your heart are made by the heart's valves as they open and close.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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In 2006, a generic antinausea drug named ondansetron was approved. It is used to stop nausea and vomiting associated with surgery, chemotherapy, and radiation therapy.
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![This portrait of Thomas Jefferson is considered an accurate likeness, painted when he was thirty-sev](https://biology-forums.com/gallery/47/medium_374628_16_08_15_9_52_08_22257994.jpeg)