Right now, as you are listening to the sound of my voice, you are breathing air. 
Air is all around you all the time. When humans go into space or beneath the surface of the ocean, the one thing you absolutely have to take with you is air. 
But what exactly makes up air? How did it get that way, and what was the air on Earth like millions of years ago?

Learn more about air, its composition, and its origin on this episode of Everything Everywhere Daily.

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Executive Producer: Charles Daniel
Associate Producers: Peter Bennett & Thor Thomsen
 
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