Tesla Inc. and SpaceX CEO Elon Musk on Friday revealed that his rocket company has made substantial progress in reusability, a goal he set 13 years ago. What Happened: Musk responded to a fan page post on the platform, which shared a video of him from 13 years ago discussing the ambitious goal of creating a fully and rapidly reusable rocket. The tech mogul responded to the video saying that SpaceX’s Falcon 9 rocket is now approximately 75% reusable, with several days needed between flights. Moreover, the company’s Starship is designed to be 100% reusable and could potentially be “ready to refl…