That's not much gold

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What would happen if a super-villain managed to take control of the world’s gold and melt it down into a cube? How big would it be? It’s often said that all the gold ever mined would only form a cube with sides of 20 metres. Is this true and how- on-earth do we know? Wesley Stephenson finds out. (Image: Gold bars. Credit: REUTERS/Arnd Wiegmann/Files)