About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
This young child is pulling at the ear and acting fussy, two important signs of otitis media.