The Smithsonian National Air and Space Museum holds more than 70,000 objects, including the 1903 Wright Flyer, the Spirit of St. Louis, and the Apollo 11 capsule. Meet the people who keep it running, and see how they tackle their biggest challenge to date. They must move all of the contents from the crumbling Paul E. Garber Facility in Maryland to the Steven Udvar-Hazy Center i…