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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).
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
There are more nerve cells in one human brain than there are stars in the Milky Way.
According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.