A professor of psychology and marketing, Adam Alter describes the rise of behavioral addiction in America - such as the unhealthy attachment to smartphones and social media, the out-of-control gaming, the desperate need to check email - and discusses the troubling problems such addictions foreshadow. Although only a few years old, Irresistible already felt outdated to me, probably because social media is evolving so rapidly. In all, Alter's research made for an interesting read but didn't teach me anything I didn't already know.