There are more nerve cells in one human brain than there are stars in the Milky Way.
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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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Everyone has one nostril that is larger than the other.
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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Aneurysm. Photograph of the aorta, the large blood vessel arising from the heart, with a large bulge