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Simply the Best Documentaries

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The Art of Persuasion
WWII In 3D
Kings
Deliver Us From Evil
Stephen Hawking Favorite Places II
Art of Eternity: Painting Paradise
R.E.M. by MTV
Race for Absolute Zero
Off the Scale
Himalaya with Michael Palin: North by Northwest
Foo Fighters: Sonic Highways
The Cell: The Hidden Kingdom
Video Games: The Movie
Flight of the Butterflies
Trinity and Beyond: The Atomic Bomb Movie
Blackfish
The Secret Life of Chaos
Is Poverty Genetic
The Power Of The Placebo
What Have UFOs Done for Us
How to Stay Young The Brain
Is Gravity An illusion
Dont Grow Old
Dawn of the Driverless Car
Feed up
Polar Bears: A Summer Odyssey
I am Ali
Cocaine Cowboys
How Big How Far How Fast
Birth of the British Novel
Blues for a Red Planet
Never Sleep Again: The Elm Street Legacy 1
Once Brothers
Mighty Amazon
In the Grip of the Seasons
Walking with Cavemen: First Ancestors

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The Clean Room
The Clean Room 2014

This episode is centered around how science, in particular the work of Clair Patterson (voiced in animated sequences by Richard Gere[33]) in the middle of the 20th century, has been able to determine the age of the Earth. Tyson first describes how the Earth was formed from the coalescence of matter some millions of years after the formation of the Sun, and while scientists can examine the formations in rock stratum to date some geological events, these can only trace back millions of years. Instead, scientists have used the debris from meteor impacts, such as the Meteor Crater in Arizona, knowing that the material from such meteors coming from the asteroid belt would have been made at the same time as the Earth. Patterson also examined the levels of lead in the common environment and in deeper parts of the oceans and Antarctic ice, showing that lead had only been brought to the surface in recent times. He would discover that the higher levels of lead were from the use of tetraethyllead in leaded gasoline resulting in government-mandated restrictions on the use of lead.

Category:Science  Duration:42:00   Series: Cosmos 2014

 
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