My second grade forensic scientists learned that each of us has unique fingerprints. The friction ridges begin to form on our fingers before we are born. The three major fingerprint patterns are whorl, arch, and loop. To make our fingerprints, we rubbed the side of a pencil on a 3×5 card. Then we rolled our finger on the dark smudge of graphite. We lifted our fingerprint off with a piece of tape, placed that tape on our lab sheet, and identified each pattern. Click here to learn more. Identify fingerprints of family members. Compare results. Did you find any commonalities?