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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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).
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
More than 4.4billion prescriptions were dispensed within the United States in 2016.
Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.