Three meditations for the eve of a new semester:Science is facts; just as houses are made of stones, so is science made of facts; but a pile of stones is not a house and a collection of facts is not necessarily science. – Henri Poincare The test of all knowledge is experiment. Experiment is the sole judge of scientific “truth”.
-Richard Feynman All models are wrong, but some are useful.
– George E. P. Box
And a couple links on teaching: