Where does Earth get its oxygen?

28 March 2014
Presented by Chris Smith

Common green birdwing butterfly

Common green birdwing butterfly


How did scientists make a synthetic chromosome? How does heat radiate? What wakes us up in the morning? Where does oxygen come from? Are black boxes bouyant? Where did the Big Bang come from? Are airbags wired to seatbelts? Do couples end up looking like each other? And why does anxiety produce butterflies in the stomach?


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