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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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.
Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.
There are more nerve cells in one human brain than there are stars in the Milky Way.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.