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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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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Cyanide works by making the human body unable to use oxygen.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.