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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.
Adults are resistant to the bacterium that causes Botulism. These bacteria thrive in honey – therefore, honey should never be given to infants since their immune systems are not yet resistant.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.