Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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There are 60,000 miles of blood vessels in every adult human.
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There are more bacteria in your mouth than there are people in the world.