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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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.