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10. SEX
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11. FREE WILL
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5. LIFE
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13. HOMEOPATHY
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GENERAL
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The demonstration that no possible combination of known substances, known forms of machinery, and known forms of force can be united in a practicable machine by which men shall fly for long distances through the air, seems to the writer as complete as it is possible for the demonstration of any physical fact to be. astronomer S. Newcomb, 1906