This video is a must see for any marketer, educator, student, oh hell for EVERYONE. What I get from it is that there are no definitives. There is no definitive guide to blah blah blah because by the time you catch up blah blah blah will have exponentially evolved. Those who are able to understand things conceptually as well as keep up with the ability to execute will be the leaders while the rest of us look on with awe.
