Where does Earth get its oxygen?

How do scientists make synthetic chromosomes? How does heat radiate? Where does oxygen come from? Why does anxiety make stomach butterflies?
28 March 2014
Presented by Chris Smith

Common green birdwing butterfly

Common green birdwing butterfly

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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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