FUN FACTS Bananas are slightly radioactive due to potassium-40, a naturally occurring isotope, but the level is harmless. Over 1,000 varieties of bananas exist, though the Cavendish is the most common in supermarkets. First domesticated in Southeast Asia, bananas have been cultivated for thousands of years. Banana peels have practical uses, such as soothing insect bites, reducing scars, or even polishing houseplants. Bananas can ripen other fruits due to the ethylene gas they emit.
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