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The longest a person has survived after a heart transplant is 24 years.

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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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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.

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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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