You're dead.

But for the sake of demonstration ... I think we should turn on the lights.

It's a few cell layers thick. On the inside you have some red blood cells bumping along.

And it doesn't have any mitochondria, no mitochondria.

I'm just gonna kind of try to target a couple of the tissues that I think people sometimes might have questions about.

And it's in every cell.

So that has no mitochondria, and it's not really using oxygen.

They found these red circular looking objects, and they looked, for all the world,

Let's go up to 2008.

It turns out, A, it's useful, and for a geek like me, it's fun.

The yellow green area is the fluid of blood, which is mostly water, but it's also antibodies, sugars, hormones, that kind of thing.

And one of them, I woudn't really call it tissue, but you can definitely call it cell type. It's the RBC, and RBC just stands for red blood cell.

Baby's blood.

And to answer this question, I would have to remind you that the red blood cell basically looks a little bit like this, right, in cross section.

DONATE YOUR BLOOD TO THE RED CROSS

Its blood is red. It must have hemoglobin.

These are literally amazingly designed cells that are made for the purpose of carrying around oxygen to the body, because they literally are bags of hemoglobin.

It fails to recognize those.

was crimson with his blood

So people sometimes wonder, you know, if the red blood cells are carrying oxygen to other parts of the body.

That is one of the reasons why AlDS is raging across Africa as fast as it is, and not as fast across Europe.

Your blood count's dropping.

The streets will run red with blood... women's blood.

So it's not using oxygen and really these cells, we call them cells and there are many senses of the word, but they don't really have mitochondria, they also don't have nucleus.

And let me draw Earth's orbit over here.

If we were to shrink you down, smaller than the smallest thing you can see with the naked eye... you will find that your piece of hair starts to look... a lot more interesting.

Logical

Theories.

The equator divides the globe into two hemispheres.

The equator divides the earth into two hemispheres.

What you're watching is a design of a robotic red blood cell, and it does bring up the issue that our biology is actually very sub optimal, even though it's remarkable in its intricacy.

I am an emotional creature.

Theoretically impossible. Theoretically.

logic game

union

intersection

difference

Union

Intersection

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Logical View

Boolean

The white blood cell count plummets.

Blood... so red...

It's not like donating to the red cross