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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.