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Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
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 most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
Did you know?
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
Did you know?
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.