“Early homo, (not H. ergaster/erectus, but habilis) has long been seen by many palaeanthropologists as another form of australopith, and the relative brain size distributions of early Homo and Australopiths overlap and are not very different. The big shift is with erectus/ergaster, and some of us have argued this is related to technology, but not the origin of stone tools; rather, the first controlled use of fire, cooking, and shortly thereafter, stone tools that are made and curated for longer term use.”