Video: Kanzi now makes his tools, just as our ancestors may have made them, two-and-a-half million years ago -- by holding the rocks in both hands, to strike one against the other.
(Video) Kanzi izgatavo darbarīkus gluži tāpat, kā to varēja darīt mūsu senči pirms divarpus miljoniem gadu – turot akmeņus abās rokās,  lai sistu tos vienu pret otru.