Get 1st Audiobook + full access to the Plus Catalog for free when you try Audible for 30 days https://www.audible.com/smarter or TXT smarter to 500500 . I recommend "The Screwtape Letters" by C.S. Lewis. A huge thank you to those who support Smarter Every Day on Patreon http://www.patreon.com/smartereveryday More calibration shots to come! Click here if you're interested in subscribing: http://