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Did you know?
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).
Did you know?
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
Did you know?
The longest a person has survived after a heart transplant is 24 years.
Did you know?
In 1864, the first barbiturate (barbituric acid) was synthesized.
Did you know?
The human body produces and destroys 15 million blood cells every second.