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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.
The familiar sounds of your heart are made by the heart's valves as they open and close.