从负暄琐话的新文章里面看到的，这段话是 Knuth 老大给 A=B 这本书做的序言，看了很令人激动，忍不住想摘下来。原文网址在这里，我无耻的抄了……

Science is what we understand well enough to explain to a computer. Art is everything else we do. … Science advances whenever an Art becomes a Science. And the state of the Art advances too, because people always leap into new territory once they have understood more about the old. This book will help you reach new frontiers.