Sake appeared from a grain of rice. Scotch came out of barley, tequila came out of agave, rum came out of sugarcane and bourbon came out of corn. Want to know more? In "Hop Nerd," Amy Stewart explores the staggering number of herbs, flowers, trees, fruits and mushrooms that people, in their ingenuity, in inspiration or desperation, have contrived to turn into alcoholic beverages over the centuries.