Book review of Cunningham’s Causal Inference: The Mixtape was accompanied by the unusual sight of multiple economists proudly posting photos (e.g. 1, 2, 3) on twitter of the arrival of the book at their houses like they had just scored tickets to a sold-out concert. This book has two fantastic features for readers interested in impact evaluation. First, Scott has provided a free online version of the book, as a compliment to the paper copy. Second, the book provides Stata and R code throughout, which both shortens the distance from theory to practice, and can serve as a great way of helping learn one language if you know the other.