David Heineimeier Hansson, the creator of Ruby on Rails and partner at 37signals in Chicago, says that planning is guessing, and for a start-up, the focus must be on today and not on tomorrow. He argues that constraints–fiscal, temporal, or otherwise–drive innovation and effective problem-solving. The most important thing, Hansson believes, is to make a dent in the universe with your company. This clip was taken from Stanford University’s Entrepreneurship Corner

This is another official update to the original “Shift Happens” video. This completely new Fall 2009 version includes facts and stats focusing on the changing media landscape, including convergence…