Forensics is the use of science to investigate crimes and analyze evidence. Investigators use many different areas of science - including chemistry, biology, and physics - to help crack cases. Fingerprinting is one of the oldest methods they use. A fingerprint is created by the oil residue left by a person's finger. Because the ridges on fingertips are unique to each person, studying the patterns left behind by a fingertip help investigators figure out the culprit! Download the Project Mc2 Case Files iOS app to test out your sleuthing skills!