WEBVTT

00:00.000 --> 00:17.800
What we find on the Earth is that we have a state in which we are able to live on the

00:17.800 --> 00:25.800
Earth. We can walk, we can move, we can climb, we can descend. What is going on? We are in

00:25.800 --> 00:32.160
a context in which we are rotating, we are on a rotating surface, we actually are accelerating.

00:32.160 --> 00:38.020
And this is a type of acceleration, accelerated motion, where we need a force that essentially

00:38.020 --> 00:44.120
pulls us into that acceleration. And we have just the right amount of force to do that,

00:44.120 --> 00:49.320
which is the level of gravitational force we are experiencing. Now our bodies are well

00:49.320 --> 00:55.800
matched to the gravitational force that we experience and the accelerations we are experiencing.

00:55.800 --> 01:00.720
So that we have a lot of dexterity on this planet. So we have sort of a harmony between

01:00.720 --> 01:04.820
the rotation of the Earth, the gravitational pull of the Earth and the strength of our

01:04.820 --> 01:10.380
bodies and the amount of energy that is available in our atmosphere with the oxygen. For example,

01:10.380 --> 01:14.680
if we didn't have a lot of oxygen in our atmosphere, we wouldn't have the energy output to be able

01:14.680 --> 01:16.180
to make the motion happen.