Elon Musk has a habit of turning science fiction into reality. From reusable rockets to autonomous vehicles and humanoid robots, the billionaire's ventures often achieve what was once thought impossible. With SpaceX's initial public offering (IPO), he's aiming for even bigger milestones. The company, which has stayed fiercely private for 24 years, is now preparing to go public. In an S1 filing to US regulators on Wednesday, which runs to hundreds of pages, SpaceX plans to raise roughly $75