If a guy is skilled at anything that's attractive. There's something very primal about that and sure it can be as simple as figuring out the tip quickly. It's really cool when a guy tips 20 percent quickly and effortlessly so that when the check comes he opens it and signs his name and done.
Agricultural practice served Darwin as the material basis for the elaboration of his theory of Evolution which explained the natural causation of the adaptation we see in the structure of the organic world. That was a great advance in the knowledge of living nature.