"It is what we know already that often prevents us from learning."
"We must keep our freedom of mind, ... and must believe that in nature what is absurd, according to our theories, is not always impossible."
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Source: Claude Bernard (2012). “An Introduction to the Study of Experimental Medicine”, p.66, Courier Corporation
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"The experimenter who does not know what he is looking for will not understand what he finds."
"When we meet a fact which contradicts a prevailing theory, we must accept the fact and abandon the theory, even when the theory is supported by great names and generally accepted."
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