Great practical read on how to hack your memory, and on the world of memory competitions. Teaches you specific actionable strategies to improve your memory.
The coolest method you learn is the "mind palace" method, which is the strategy all professional memory competitors use to memorize large amounts of information like lists, phone numbers, stacks of cards, books, and more - you learn the method in the book, and you get to try it yourself - and it works surprisingly well, almost immediately.