Listened Quotes (1 quote)
I took him [Lawrence Bragg] to a young zoologist working on pattern formation in insect cuticles. The zoologist explained how disturbances introduced into these regular patterns pointed to their formation being governed by some kind of gradient. Bragg listened attentively and then exclaimed: Your disturbed gradient behaves like a stream of sand running downhill and encountering an obstacle. Good heavens, replied the zoologist, I had been working on this problem for years before this simple analogy occurred to me and you think of it after twenty minutes.