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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 modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.