And in Seattle, we take these this is a whole human hemisphere and we put them into what's basically a glorified meat slicer.

'OK, I understand what the tilt is, but how does that change the seasons, the .. of the Northern or that Southern Hemisphere.

Notice all of our rovers and all of our landers have gone to the northern hemisphere.

Northern hemisphere

Southern hemisphere

There's the left half, which is the logical side, and then the right half, which is the intuitive.

But what scientists don't know is where in the brain these languages are stored.

The two hemispheres do communicate with one another through the corpus callosum, which is made up of some 300 million axonal fibers.

Let me draw the Equator which separates our Northern and Southern hemispheres.

I'll draw the Equator in the same color actually, in that green color.

Hemisphere

Where r is the radius of the sphere.

So this is the total amount of sunlight that's reaching the Earth at any point time.

There's some missing puzzle pieces.

The Sun is 93 million miles away, and we're tilting like this, right?

So the South will have summer.

Well, let's think about it.

It is as if, one by one, the memories you used to harbor decided to retire to the southern hemisphere of the brain to a little fishing village where there are no phones.

But other than that, the two hemispheres are completely separate.

If you've ever seen a human brain, it's obvious that the two hemispheres are completely separate from one another.

The equator divides the globe into two hemispheres.

The equator divides the earth into two hemispheres.

But look in the southern hemisphere.

When you think about it, the oceans are 75 percent of the planet.

Again, it's got technology it's got electrodes going into its left and right hemispheres it's got a camera on top of its head.

Finally, the Greeks also knew that the sun appears lower in the sky as you travel north.

The United States is in the Northern Hemisphere.

And then down here, the Southern Hemisphere is pointed away from the Sun, so, this is winter in the Southern Hemisphere.

I've pedaled this damn thing halfway around the world.

Japan is located in the Northern Hemisphere.

We found that we could discover the causation of the positive states, the relationship between left hemispheric activity and right hemispheric activity as a cause of happiness.

Roughly, at the same time, Carnegie

Some of us may have opted for one of these extremes, but I think for most people in the audience, your brain is something like this with a high aptitude in both hemispheres at the same time.

No, no, that's the only place a ship's been.

And in particular, it really goes against what we experience in the northern hemisphere, because our perihelion right now is occurring in January. It is occurring during the winter, the northern hemisphere winter.

So that's probably (I guess you could say) the biggest point of data that we observe on our planet why this by itself can not explain the change in seasons.

The acoustic transit time for each of these paths is about three hours.

So, this is the Equator.

If you had half a brain you'd be dangerous!

You can freeze half its heart. It regrows.

It's there inside all of us, and its got more divided over the course of human evolution.

And yes, the red planet is red.

So, this is summer in the South, the Southern Hemisphere, and it's winter in the North.

What is shown in the above experiment is that the right hemisphere of the brain is not used at all.

This is a sculpture of the Sun and the Earth, in proportion.