The classroom was completely destroyed and an eco-greenhouse, made using plastic bottles, melted.

BBC: Hazlewood School fire aftermath

Cables fell and trapped Mr Shears and Mr Bannon after plastic trunking they were cased in melted - and the pair had no cutting equipment to free themselves.

BBC: Jim Shears (left) and Alan Bannon

IBM's design involved feeding small plastic wafers into a heated pump that melted them and pushed the goo through an extruder.

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