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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?
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
Did you know?
If you could remove all of your skin, it would weigh up to 5 pounds.
Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
On average, the stomach produces 2 L of hydrochloric acid per day.