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We are probably nearing the limit of all we can know about astronomy.
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Quite likely the twentieth century is destined to see the natural forces which will enable us to fly from continent to continent with a speed far exceeding that of a bird.
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As years passed away I have formed the habit of looking back upon that former self as upon another person, the remembrance of whose emotions has been a solace in adversity and added zest to the enjoyment of prosperity.
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My first undertaking in the way of scientific experiment was in the field of economics and psychology.
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Aerial flight is one of that class of problems with which men will never have to cope.
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Construction of an aerial vehicle which can carry even a single man . . . requires the discovery of some new metal or force. Even with such a discovery, we could not expect one to do more than carry its owner.
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Astronomers are greatly disappointed when, having traveled halfway around the world to see an eclipse, clouds prevent a sight of it; and yet a sense of relief accompanies the disappointment.
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Whenever a total eclipse of the sun was visible in an accessible region parties were sent out to observe it.
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Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible.
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The time was not yet ripe for the growth of mathematical science among us, and any development that might have taken place in that direction was rudely stopped by the civil war.