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Continue to ChatThe demonstration that no possible combination of known substances, known forms of machinery and known forms of force, can be united in a practical machine by which men shall fly along distances through the air, seems to the writer as complete as it is possible for the demonstration to be. - Simon Newcomb from https://whatsmyquote.com/quote/the-demonstration-that-no-possible-combination-of-known-substances-known-forms-of-machinery-and-known-forms-of