David Hall is one of history’s rare technological visionaries with the imagination and technical wherewithal to recognize a problem, conceive a solution, and then build something that works. On December 6 at the U.S. Chamber of Commerce’s event, LAUNCH: Industry Taking Off, David Hall presented his world-changing solution to a longstanding problem: how to carry materials and people into space safely, reliably, and efficiently. The audience of industry, military, and policy representatives he...