Like many of you, I bit on the Up-Goer Five Text Editor. I marveled at "Hamlet" in the ten hundred most common English words. Jumping in, I took the challenge.
How could natural selection operate so that "the good ones spread in the population" if there were no positive variants in the first place? That is why I am confounded by Jerry Coyne's comment that he can explain natural genetic engineering by "garden variety natural selection."