This is called a cycle valve tube.

And this is how you make a valve.

This is actually a heart valve, which we engineered.

Does the color of the valve matter? What matters here?

Now that's a left ventricle pushing blood up through the aortic valve you can see two of the leaflets of the aortic valve working there up into the ascending aorta.

And the way you engineer this heart valve is the same strategy.

This is actually a heart valve that we've engineered, and you can see here, we have the structure of the heart valve and we've seeded that with cells, and then we exercise it.

They're not these little harbor seals.

It has a funny trilobal shape at the bottom, which contains the aortic valve.

The symbols are most commonly found on seals.

C. Convention for the Conservation of Antarctic Seals

As a species, as humans, we like to say penguins are really cute, therefore, leopard seals eat them, so leopard seals are ugly and bad.

These ringed seals, these are the fatsicles of the Arctic.

Now, what leopard seals do mostly is, they eat penguins.

And they're not like the harbor seals that you have here.

Even so God seals the hearts of those that know not.

Even so God seals the hearts of those that know not.

God thus seals the hearts of those who do not know.

God thus seals the hearts of those who do not know.

Then he opens the ears of men, and seals their instruction,

Then he opens the ears of men, and seals their instruction,

Leopard seals, since the time of Shackleton, have had a bad reputation.

As such Allah seals the hearts of those who do not know.

As such Allah seals the hearts of those who do not know.

Some packaging will include rubber seals on lids and some will not.

The customs officer seals the Declaration and the SAD with personal seal.

Even trips to the dentist require that you take antibiotics, in case you get an internal infection on the valve.

People bring their own cooker, he attaches a valve and a steam pipe, and now he gives you espresso coffee.

Photographer Paul Nicklin traveled to Antarctica to shoot a story on leopard seals.

That is how God seals the hearts of those who do not know.

That is how God seals the hearts of those who do not know.

He commands the sun, and it doesn't rise, and seals up the stars.

He commands the sun, and it doesn't rise, and seals up the stars.

We take the scaffold, we seed it with cells, and you can now see here, the valve leaflets opening and closing.

Its unique cool flow valve can efficiently discharge hot and damp exhaled breath from inside the respirator, allowing easier breathing for users.

Likewise, if you have the artificial valve option, you're committed to antibiotic therapy whenever you have any intrusive medical treatment at all.

So, the most beautiful thing I found at least what I think is the most beautiful in the book, is this heart valve.

So this is actually a Dutch company, so I called them up, and I asked, Can I borrow a heart valve from you?

Great and then I didn't hear from them for weeks, so I called, and I asked, What's going on with the heart valve?

And he has a lot of experience with leopard seals. I have never seen one.

These elephant seals cover half an ocean, take data down to 1,800 feet amazing data.

The Convention for the Conservation of Antarctic Seals entered into force on 11 March 1978.

He turned the wrong valve when he filled his cylinder he had 80 percent oxygen in his tank when he should have had 40.

The low tech bit is that it's literally a pig's heart valve mounted in the high tech bit, which is a memory metal casing.

So as I showed you, they're usually found on these seals that are very, very tiny.