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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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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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Thyroid conditions may make getting pregnant impossible.
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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.