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The human body produces and destroys 15 million blood cells every second.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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In 1864, the first barbiturate (barbituric acid) was synthesized.