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Cyanide works by making the human body unable to use oxygen.
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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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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.