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What we find on the Earth is that we have a state in which we are able to live on the

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Earth. We can walk, we can move, we can climb, we can descend. What is going on? We are in

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a context in which we are rotating, we are on a rotating surface, we actually are accelerating.

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And this is a type of acceleration, accelerated motion, where we need a force that essentially

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pulls us into that acceleration. And we have just the right amount of force to do that,

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which is the level of gravitational force we are experiencing. Now our bodies are well

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matched to the gravitational force that we experience and the accelerations we are experiencing.

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So that we have a lot of dexterity on this planet. So we have sort of a harmony between

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the rotation of the Earth, the gravitational pull of the Earth and the strength of our

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bodies and the amount of energy that is available in our atmosphere with the oxygen. For example,

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if we didn't have a lot of oxygen in our atmosphere, we wouldn't have the energy output to be able

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to make the motion happen.