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Did you know?
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.