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Look at your fingers. The tiny lines you see are called fingerprints, and no two people on Earth have the same pattern — not even identical twins. Fingerprints form before you are born when the skin develops unique patterns like loops, whorls, and arches. But humans aren’t the only ones with unique patterns. Cats also have unique nose prints, meaning every cat’s nose pattern is different. Because fingerprints are unique, we use them every day — to unlock smartphones, secure doors, and identify p