An astronaut reveals the most impressive thing about SpaceX is not its rockets or spaceships

· SpaceX, the rocket company founded by Elon Musk, is about to launch its first human passengers.
· NASA astronauts Bob Behnken and Doug Hurley will fly SpaceX's new Crew Dragon vehicle to orbit on or after May 27.  
· Before the test mission, called Demo-2, Behnken told Business Insider the most impressive thing about...