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Why is oxygen essential to steelmaking, how do you extract it from the air, and can you inhale too much of it? Answering these questions leaves presenter Justin Rowlatt almost breathless.
By BBC World Service4.7
136136 ratings
Why is oxygen essential to steelmaking, how do you extract it from the air, and can you inhale too much of it? Answering these questions leaves presenter Justin Rowlatt almost breathless.

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