Ever heard of a global academic community? You may soon enough if the Tinkering School has anything to say about it. David sits down with Tinkering School Founder Gever Tulley, and the Tinkering School Volunteer Space Agency (VSA) - a student group formed by Tinkering School students and alumni - to talk about how they transformed a classroom into a Mars lava tube, built web-controlled rovers, and now are opening their online doors to facilitate "Mars Missions" for schools from around the wor...