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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.