Author Correction: Two million years of flaking stone and the evolutionary efficiency of stone tool technology

In the version of this Article originally published, the authors mistakenly included duplicate entries in the flake datasets for the new Pech de l'Azé IV and Warwasi collections, resulting in minor errors in the statistical analysis. The authors have now repeated this analysis with the correct flake datasets. As a result, in the following two sentences, the number of flakes has been changed from 19,000 to 18,000: "Using more than 18,000 flakes...