The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.
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There are approximately 3 million unintended pregnancies in the United States each year.
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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
The greenhouse effect: heat trapping by earth's atmosphere.