The Proceedings of the National Academy of Sciences (PNAS), , a peer reviewed journal of the National Academy of Sciences (NAS), has published a new article titled “Competition and moral behavior: A meta-analysis of forty-five crowd-sourced experimental designs” co-authored by Petra Nieken. The study follows a rigor and innovative open science paradigm: Independent research teams were invited to contribute experimental designs to a crowd-sourced project. In a large-scale online data collection, 18,123 experimental participants were randomly allocated to 45 randomly selected experimental designs out of 95 submitted designs. The results demonstrate that variation in effect size estimates across the 45 designs is substantially larger than the variation expected due to sampling errors. This “design heterogeneity” highlights that the generalizability and informativeness of individual experimental designs are limited.