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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Everyone has one nostril that is larger than the other.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).
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There are more nerve cells in one human brain than there are stars in the Milky Way.
The nucleus of Comet Tempel 1.
Comet Shoemaker-Levy 9 and Its Encounter with Jupiter