This book deals with memory, specifically of the "World Memory Championship" variety, but also just the role of memory throughout human history. It's a well-paced, very interesting book, and details not only the author's increasing obsession with competitive memorizing but how important memory was to society, a shocking reminder especially during this era of "external" memory, where everything is online or on our phones. He provides the secret to "remembering everything", as he says in the subtitle, but doesn't expound on it too greatly. While it is a very interesting read, I feel like there is still a lot that could have been said about making use of our internal memories in a productive way.