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Being able to replicate scientific findings is crucial for scientific progress^{, , , , , , , , , , , , , –}. We replicate 21 systematically selected experimental studies in the social sciences published in Nature and Science between 2010 and 2015^{, , , , , , , , , , , , , , , , , , , –}. The replications follow analysis plans reviewed by the original authors and pre-registered prior to the replications. The replications are high powered, with sample sizes on average about five times higher than in the original studies. We find a significant effect in the same direction as the original study for 13 (62%) studies, and the effect size of the replications is on average about 50% of the original effect size. Replicability varies between 12 (57%) and 14 (67%) studies for complementary replicability indicators. Consistent with these results, the estimated true-positive rate is 67% in a Bayesian analysis. The relative effect size of true positives is estimated to be 71 …