And yet, in two million years, the human brain has nearly tripled in mass, going from the one-and-a-quarter-pound brain of our ancestor here, Habilis, to the almost three-pound meatloaf everybody here has between their ears.
Todavia, em dois milhões de anos,  a massa do cérebro humano quase triplicou. Passou de pouco mais de meio quilo  do nosso antepassado, o Homo Habilis, para o rolo de carne de quase 1,5 kg  que toda a gente tem entre as orelhas.