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Perfect as the wing of a bird may be, it will never enable the bird to fly if unsupported by the air. Facts are the air of science. Without them a man of science can never rise.
Russian physiologist who observed conditioned salivary responses in dogs (1849-1936)
All Ivan Pavlov quotes | Ivan Pavlov Books
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"Ivan Pavlov Quotes." Quotes.net. STANDS4 LLC, 2017. Web. 25 Feb. 2017. <http://www.quotes.net/quote/21141>.
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