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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
The familiar sounds of your heart are made by the heart's valves as they open and close.
Approximately 500,000 babies are born each year in the United States to teenage mothers.
Your chance of developing a kidney stone is 1 in 10. In recent years, approximately 3.7 million people in the United States were diagnosed with a kidney disease.
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.