Human civilization moved at a snail's pace for millennia until industrialization. Machines however have seen explosive growth in capability since the 18th century. The human body is like a Swiss Army knife that can perform many tasks well, but if I want to cut through a 2x4 I'll use a circular saw and if I want to butter my bread I'll use a butter knife. Machines permit greater specialization and differentiation than do our bodies. The trend lines of the capabilities of man and machine seem clear to me.
