The Last Word with Lawrence O'Donnell 03/23/15

Obama’s science fair: Smart robots & more

At the White House's 5th Annual Science Fair, President Obama laid out the ground rules (no explosions, please), met some super Girl Scouts, made some waves (literally), and noticed how the robots get smarter every year saying, "You're on notice, Skynet." ... more Duration: {{video.duration.momentjs}}