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"A person observing the occurrence of certain facts and phenomena asks, naturally enough, what process, what kind of operation known to occur in Nature
applied to the particular case, will unravel and explain the mystery? Hence you have the scientific hypothesis, and its value will be proportionate to the care and completeness with which its basis had been tested
and verified. ...the results depends on the patience and faithfulness with which the investigation applies to his hypothesis every possible kind of verification." --- The Method of Scientific
Investigation (1855), Thomas Huxley (1825-1895)