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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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Blood is approximately twice as thick as water because of the cells and other components found in it.