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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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Cyanide works by making the human body unable to use oxygen.

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There are more bacteria in your mouth than there are people in the world.

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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

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Excessive alcohol use costs the country approximately $235 billion every year.

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