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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.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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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.