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.
Mind huvitavad hoopis erisused, sest seda vasakpoolset valmistati üsna muutumatul kujul umber miljon aastat - ajavahemikus poolteist miljonit aastat tagasi kuni pool miljonit aastat tagasi.