Plot summary
After an unknown man opens fire in the FBI offices, causing carnage and destruction, Don and his team must investigate his motive and his connection to a dangerous arms dealer who is on trial. Meanwhile, Don soon learns that the bullet that killed the sex offender the team interviewed came from Colby's gun, forcing Colby to be put on desk duty for the time being. Mathematics used: Chaos theory, Brownian motion, Self-organized criticality, Venn diagram and tesseracts / hypercubes
Credits
Adapted from Wikipedia contributors, Numbers season 2. HTML formatting and reference markers removed.