What Can't Be Done? ("Whatever Happened to the Future?" June 2018) This is a terrific article that I read with great interest. I am a licensed pilot with a degree in aeronautical engineering. I supervised 50 design engineers on the Apollo backpack used on the moon. When I was a kid in Brookfield, Massachusetts, in the 1940s, the old-timers told me the moon was made of blue cheese and that going there was inconceivable. Well, it turned out that we did it in my lifetime and that I worked on it! The next challenge for humans is to exceed the speed of light. Your article points out that, currently, impossible technology is needed. No problem! Humans are always thinking about and working on the next impossible barrier.
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