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The Last Big Advance in Jet Engines and Rocket Engines
The National Gallery of Art was endowed by a very rich man,. Andrew Mellon, and you know how he made his money? Aluminum. What kind of airplanes you can create without aluminum? Nothing. So there's like two pretty basic technologies. And once you have those two technologies, stuff happens very fast. The big advances in spaceship design from what I can see are in the control systems, the gyros and the ability to land - that's pretty amazing landing a rocket.