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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.
Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.