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If it can't be expressed in figures, it is not science; it is opinion. It has long been known that one horse can run faster than another - but which one? Differences are crucial.

Robert A. Heinlein
Running, Horse, Differences
Robert A. Heinlein (1987). “Time Enough for Love”, p.222, Penguin
If it can't be expressed in figures, it is not science; it is opinion. It has long been known that one horse can run faster than another - but which one? Differences are crucial.