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Did you know?
There are 60,000 miles of blood vessels in every adult human.
Did you know?
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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?
Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.