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Each time the discovery of new facts, the overthrow or extension of accepted theories, reminded us that science is never finished.
Charles Fabry
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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.
Ivan Pavlov
Science is built up of facts, as a house is with stones. But a collection of facts is no more a science than a heap of stones is a house.
Henri Poincaré
Science is progressing at such a rapid rate that when you make a prediction and think you are ahead of your time by 100 years you may be ahead of your time by 10 at most.
Leó Szilárd
Hegel remarks somewhere that all great world-historic facts and personages appear, so to speak, twice. He forgot to add: the first time as tragedy, the second time as farce.
Karl Marx
The work of science is to substitute facts for appearances, and demonstrations for impressions.
John Ruskin