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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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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
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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.