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Simply the Best Documentaries

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The Red Sea
Kings
The Mystery of Dark Energy
Our Universe
Is There Life After Death
Banking on Bitcoin
Nigeria Oil Pirates
Why Do We Dream
Indefensible
Bobby Fischer Against the World
How the Universe Built Your Car
Clash of the Gods: Hades
The Atlantic
Virunga
To The Arctic
In Search of Beethoven II
Blood Filled Streets
Destination Titan
Dolphins and Whales
City Maps
Which Universe Are We In
Cooked: Air
Gravity and Me The Force that Shapes our Lives
The Nightmare
Hot Girls Wanted
Is Time Travel Possible
Nothing
Know Your Mushrooms
Second Earth
The True Cost
Ocean Wonderland 3D
Everything
Flying Monsters
The Germanic Tribes: Barbarians Against Rome
An Everyday Miracle
Unlocking the Great Pyramid

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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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