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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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Blood is approximately twice as thick as water because of the cells and other components found in it.