I just read: “Once, in the southern Jordanian desert, Avi (Shmida, an Israeli botanist) pointed out a single succulent green plant where the only other gross was dry, dusty scrub. ‘What do you know when you see a green plant in the desert?’ he asked. I shook my head, and he exclaimed: ‘It’s poison! Otherwise something would’ve eaten it by now.'” – An excerpt from “Who Gets What and Why”.