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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Did you know?
There are 60,000 miles of blood vessels in every adult human.
Did you know?
It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
Did you know?
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.