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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
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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.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
![This engraving by William Russell Birch shows Congress Hall (left), which was occupied by Congress f](https://biology-forums.com/gallery/47/medium_374628_16_08_15_9_52_06_222501221.jpeg)
![In the summer of 1793, a yellow fever epidemic struck Philadelphia, killing nearly 4,000. Tens of th](https://biology-forums.com/gallery/47/medium_374628_16_08_15_9_52_07_222511109.jpeg)