Author Michael Pollan will appear at Portland's Newmark Theatre at 7:30 p.m. July 27. Pollan is the author of "The Omnivore’s Dilemma" and "How to Change Your Mind." He will discuss "This Is Your Mind on Plants," a book that explores three plant drugs — opium, caffeine and mescaline — and throws the strangeness, and arbitrariness, […]