If you ask evolutionary biologists when did humans become humans, some of them will say that, well, at some point we started standing on our feet, became biped and became the masters of our environment.
Se perguntarem a biólogos evolutivos quando os humanos se tornaram humanos, alguns dirão que, bem, a dada altura começámos a estar de pé, tornámo-nos bípedes e senhores do nosso meio envolvente.