Stone tools, stone lessons, stone words

Nature reports on new clues that we learned to talk by learning to cut meat:

Here we present an experiment investigating the efficacy of transmission of Oldowan tool-making skills along chains of adult human participants (N=184) using five different transmission mechanisms. Across six measures, transmission improves with teaching, and particularly with language, but not with imitation or emulation. Our results support the hypothesis that hominin reliance on stone tool-making generated selection for teaching and language….

The better you talk, the sharper your stone knives.