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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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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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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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Your heart beats over 36 million times a year.