Every person's fingerprints are different from everyone else's. Not even identical twins have the same fingerprints. Make the point by studying your own and then compare it to a friend's fingerprint. Using a soft lead pencil, rub a dense, dark spot on paper. Then rub your finger on the spot. When your fingertip is good and black, put a piece of transparent tape on it. Pull the tape off and stick it to white paper. There's your fingerprint! Look for loops, arches, and whorls. They are the patterns experts analyze when they identify people.