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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.