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Did you know?
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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The longest a person has survived after a heart transplant is 24 years.
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The average office desk has 400 times more bacteria on it than a toilet.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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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.