Volume 36 of The Hacker Digest consists of articles published in 2600Magazine from 2019 to 2020 on nearly 100 subjects of interest tohackers and those who want to understand what hacking is all about. Inaddition, all of the popular payphone photos, back cover photos, andexpanded front cover artwork are included in this volume. There arealso individual "Hacker Perspective" columns - from both well-knownhackers as well as some new voices - describing their experiences,thoughts, and philosophies on the subject of hackers and their placein society. This edition continues with our three staff columns:"Telecom Informer," which focuses on issues of telephony worldwide;"EFFecting Digital Freedom," from members of the Electronic FrontierFoundation, providing an insider look on the many fronts where thebattle for digital liberty is being staged; and "Citizen Engineer,"written by the founders of Adafruit Industries and Hackaday, dealingwith all sorts of technological developments and intrigue. Finally,the book is rounded out with one of the most popular features: theletters to the editor (nearly 200 in this edition), often with bitingretorts from the 2600 staff.