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Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.