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The little known story of the Welsh scientists who developed atomic weapons and how their research eventually turned to peace.

When Britain decided to share secrets about how to build a bomb with America, Cockett born Edward Taffy Bowen was tasked with carrying those secrets and sensitive equipment to the US. But they almost didn't make it!

Meanwhile, in Rhydymwyn, north Wales, ground-breaking research contributed to Oppenheimer's work at Los Alamos.