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Albert Einstein, 1895-1955

The test of all knowledge is experiment. Experiment is the sole judge of scientific thruth.

When you can measure what your are speaking about, and express it in numbers, you know something about it;

but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind.

Richard P. Feynman, 1918-1988

Theory suggests but experiment decides.

Sir William Thomson, lord Kelvin, 1824-1907

Isaak M. Kolthoff, 1894-1993

No amount of experimentation can ever prove me right;a single experiment can prove me wrong.

and

If you cant explain it simply, you dont understand it well enough.

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