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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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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.