Steve Jobs was kind of a mysterious guy. The CEO of Apple spoke openly about how his experimentation with LSD changed his life. His keynote speeches at Apple's Worldwide Developers Conferences were the stuff of legend, with geeks everywhere scrambling to figure out what gadget he was going to unveil next. His death on Oct. 5, 2011 prompted thousands of people to share their memories and impressions of a man most describe as a visionary. Take our quiz to find out how well you know the man.