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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.
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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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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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The longest a person has survived after a heart transplant is 24 years.