“I have in mind the notion that is so fashionable nowadays, namely that we live in a Dark Age where puny Science quails before many a dim Unknown on every hand. Surely this sort of facile pessimism dampens the energy of inquiry even as it leads to obscurantism—toward a despair of certainty which encourages us to embrace truths, half-truths, and the most extravagant falsehoods with a promiscuous lack of discrimination.”