The differences are what interest me, because the one on the left was made to a pretty unvarying design for about a million years -- from one-and-a-half million years ago to half a million years ago.
Forskellene er, hvad interesserer mig. Fordi, den til venstre blev lavet efter et temmelig uvarieret design i omkring en million år - fra 1½ millioner til ½ millioner år siden.