“For anyone interested in the science of persuasion, psychology professor Robert Cialdini has been the expert of choice since the 1970s. During his long career at Arizona State University, he has studied everything from the ways blood banks attract donations to the reasons why some people pick up litter and others don’t. Cialdini’s best-known book, Influence, has sold 2.5 million copies worldwide. It remains one of Amazon’s top 500 titles, 31 years after its debut.”