The last "giant leap" was pointed out by a certain famous naval aviator in the summer of '69.
Seriously, not studying things thoroughly? Just think this through for a minute. Would these things even be possible if we had not studied them thoroughly? In today's anally safety-conscious, officious and bureaucratically choked world, would anything even be allowed without extensive safety testing? Nothing is perfect of course, but seriously, any slower and we wouldn't be moving.
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