Way back in the summer of 2013, SpaceX's Elon Musk proposed a new transportation system that was equal parts awesome and insane: The Hyperloop. Unfortunately, that was the extent of Musk's involvement: He gave us his plans in the form of a 57-page white paper, and then told the world to go ahead and build it. Now, a group of 100-odd engineers have banded together to try and actually create a Hyperloop -- and they seem to be making pretty solid progress.