Knowledge is of no real value if all you can tell me is what happened yesterday. It is necessary to tell what will happen tomorrow.
“Every scientific law, every scientific principle, every statement of the results of an observation is some kind of a summary which leaves out details.”
“All advances in engineering are tested first on small-scale models, in wave tanks, or in wind tunnels. Without models, the research would be prohibitively expensive, and progress would be correspondingly slow.”