“The 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 man shall fly long distances through the air, seems to the writer as complete as it is possible for the demonstration of any physical fact to be.
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"Simon Newcomb (declared in 1901) Quotes." Quotes.net. STANDS4 LLC, 2013. Web. 18 Jun 2013. <http://www.quotes.net/quote/36325>.

