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Here are 5 facts that will make you question reality. fact number 1: Your body has about 37 trillion cells, but the bacteria living on you can outnumber them. fact number 2: Octopuses have three hearts and blue blood. fact number 3 There are more trees on Earth than stars in the Milky Way galaxy. fact number 4: A cloud can weigh over a million kilograms. fact number 5 Sharks existed before trees appeared on Earth.