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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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The longest a person has survived after a heart transplant is 24 years.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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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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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.