Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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The largest baby ever born weighed more than 23 pounds but died just 11 hours after his birth in 1879. The largest surviving baby was born in October 2009 in Sumatra, Indonesia, and weighed an astounding 19.2 pounds at birth.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
External view of the right eye.
Organization of the nervous system.
Simplified view of retrovirus life cycle
Computer Organization and Architecture
Organization of (a) the Alpha-globin gene subfamily on chromosome 16