[Owen Bush, a blacksmith, is working in his forge, alternating between heating iron in a furnace and hitting it on an anvil]
Mark Miodownik: This whole process of bashing it and then putting it back in the furnace is to get purer and purer iron? You're trying to purify this very strange substance that's come out of the furnace?
Owen Bush - Blacksmith: Yeah, I'm literally beating the crap out of it.