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Mad scientist Colin Furze—he of the apocalypse bunker, toasting knife, and rocket-powered go-kart among other things—has spent the past few weeks painstakingly building a grenade-launcher of sorts ...

The look of glee on his face shows Colin Furze is pretty pleased with himself. The YouTube star and self-confessed crazy inventor has upped the drama in his latest video – by creating a homemade ...

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