What we find on the Earth is that we have a state in which we are able to live on the
Earth. We can walk, we can move, we can climb, we can descend. What is going on? We are in
a context in which we are rotating, we are on a rotating surface, we actually are accelerating.
And this is a type of acceleration, accelerated motion, where we need a force that essentially
pulls us into that acceleration. And we have just the right amount of force to do that,
which is the level of gravitational force we are experiencing. Now our bodies are well
matched to the gravitational force that we experience and the accelerations we are experiencing.
So that we have a lot of dexterity on this planet. So we have sort of a harmony between
the rotation of the Earth, the gravitational pull of the Earth and the strength of our
bodies and the amount of energy that is available in our atmosphere with the oxygen. For example,
if we didn't have a lot of oxygen in our atmosphere, we wouldn't have the energy output to be able
to make the motion happen.