• Isolated facts and experiments have in themselves no value, however great their number may be. They only become valuable in a theoretical or practical point of view when they make us acquainted with the law of a series of uniformly recurring phenomena, or, it may be, only give a negative result showing an incompleteness in our knowledge of such a law, till then held to be perfect.

    Hermann von Helmholtz, David Cahan (1995). “Science and Culture: Popular and Philosophical Essays”, p.208, University of Chicago Press