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hy do some things burn, while others refuse to catch fire? It's something listener Alix from the UK has been wondering about. Fire has defined our civilisation for millennia - but what's actually happening inside a material when it burns? Presenter Alex Lathbridge attempts to (safely) set various things alight to understand the chemistry of combustion. Why do different substances react differently to heat, either melting, smouldering, or going up in flames? He learns why some compounds are resistant to burning and meets scientists creating fireproof materials to make our homes and cities safer.