SACH-SAWCH

But what WAS functional? More exactly, what aspects or combinations allow very low energy usage when humans walk? That, but, amputees in mind, to not get drowned in a useless numbers-only publication title wave. If you can't replace the flesh can you replace what that flesh did? Engineering . This is called Rehabilitation Engineering. The lowest energy to get from point A to point B = STRAIGHT LINE. Use a wheel? On level ground a wheel can do that. On the average over the human millennia how much flat level ground was there? ZERO. The wheel wasn't the first great invention. The cleared ground leveled“ROAD” was. Wheels don't do much in jungles or meadows. Legs take us where wheels cannot go. Over a wall. Up a tree. Through mud. Deep diving. But the big one is and has been uneven ground. We are wanderers. Those paths least taken are bumpy.

Inman told us: On jointed limbs the next lowest energy from A to B would be a low amplitude sine wave approaching a straight line. That path is the path of our center of mass ( a location where we balance). How do humans walk? The center of mass of an adult travels a 2 inch high

sine wave up and down from A to B. Side to side sway is similar. Center of mass is just forward the L5-S1 disc (in the pelvis). It is close to being above a line drawn between the right & left HIP CENTERS. Stow this away. Later, we'll see that the fact that hip centers being fixed in place in