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Did you know?
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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The human body produces and destroys 15 million blood cells every second.
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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.