When it comes to great new technologies, you’d be surprised to know how many of them were initially deemed as failures. Take for example the mouse, the pacemaker, Virtual reality, and the synthetic fiber Kevlar. Each of these marvelous technologies impacted our world significantly in these last few decades, haven’t they? However, did you know that all of them actually started off as failed inventions? Find out the real history behind the failure, and then the eventual success, of these four super technologies in this video.