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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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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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Cyanide works by making the human body unable to use oxygen.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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People about to have surgery must tell their health care providers about all supplements they take.