“Perfect as is the wing of a bird, it never could raise the bird up without resting on air. Facts are the air of a scientist. Without them you never can fly. Without them your "theories" are vain efforts.”
Bequest of Pavlov to the Academic Youth of His Country. Science, Vol. 83, Issue 2155, pg. 369 (1936)
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Ivan Pavlov6
Russian physiologist 1849–1936Related quotes
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