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Did you know?
About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
Did you know?
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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The longest a person has survived after a heart transplant is 24 years.