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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.
Cyanide works by making the human body unable to use oxygen.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Medication errors are more common among seriously ill patients than with those with minor conditions.
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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