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5 Crazy Facts That Sound Fake Fact 1: Bananas are slightly radioactive They contain potassium… including a tiny bit of radiation. Fact 2: Octopuses have three hearts And their main heart stops when they swim! Fact 3: Sharks existed before trees They’ve been around for over 400 million years. Fact 4: Your brain cleans itself while you sleep Like a built-in overnight cleaning system. Fact 5: Honey never spoils Even ancient jars are still edible today.