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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).
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.