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Author Question: Suppose you observe two children, sitting together and occasionally looking at each other, but not ... (Read 42 times) |
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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.