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.Rate it:(0.00 / 0 votes)Say it

Ivan Pavlov

Russian physiologist who observed conditioned salivary responses in dogs (1849-1936)

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"Ivan Pavlov Quotes." Quotes.net. STANDS4 LLC, 2014. Web. 23 Nov. 2014. <http://www.quotes.net/quote/21141>.

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