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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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Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.