While visiting Magna in Rotherham recently, my son asked me a question I couldn't answer. What is the bucket that pours the molten steel made of? And how is it made? It must be made of an alloy with a higher melting point than steel, so how is it made? And how is the machinery used to make that made? And how is the machinery used to make that machinery made? You could go on for some time with this chain of production, but it all comes down to how do you make machinery for something that has a massively high melting point? What is it made of and how is it made?

Thanks for your help,

Peter and Alfie Finan, Haworth, West Yorkshire