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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The human body produces and destroys 15 million blood cells every second.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.