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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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Critical care patients are twice as likely to receive the wrong medication. Of these errors, 20% are life-threatening, and 42% require additional life-sustaining treatments.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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The human body produces and destroys 15 million blood cells every second.