Our fingerprints are what make us unique -- but they're also home to a world of information hidden in molecules that reveal our actions, lifestyles and routines. In this riveting talk, chemist Simona Francese shows how she studies these microscopic traces using mass spectrometry, a technology that analyzes fingerprints in previously impossible detail, and demonstrates how this cutting-edge forensic science can help police catch criminals. (Note: This talk contains descriptions of sexual violence.)