What better way to understand how to make a handaxe or cleaver than getting into an Acheulean quarry and doing it yourself. The authors experimented at Isampur Quarry in India, finding that handaxes were best produced by reducing a slab to shape, while cleavers were best made by striking large flakes. There was a good correspondence with the ancient implements, and the authors deduced that Acheulean hominins were learning and transmitting standardised manufacturing methods to each other.