We thank Simon Cordes, Ingar Haaland, Luca Henkel, Lukas Hensel, Matt Lowe, Shakked Noy and Nicolas Roever for very useful and constructive comments. The research described in this article was approved by the University of Chicago Social and Behavioral Sciences Institutional Review Board. Duckworth acknowledges financial support from the Walton Family Foundation. Bursztyn is founder and CEO of NOMO Technologies, Inc., a company that develops digital wellness tools, and holds equity in the company.