"Facts are the air of science. Without them a man of
science can never rise. Without them your theories are
vain surmises. But while you are studying, observing,
experimenting, do not remain content with the surface of
things. Do not become a mere recorder of facts, but try to
penetrate the mystery of their origin. Seek obstinately
for the laws that govern them!"—*lvan Pavlov, quoted
in *Isaac Asimov's Book of Science and Nature Quotations,
p. 99.

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