Given the different contractions of the two different metals as a result of the cold, when it gets cold enough iron cannonballs will fall off a brass monkey.

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It would take cold, hard steel, made from hot molten iron.

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It was also a symbol of hope during the cold war, a place where scientists from both sides of the iron curtain could work together on peaceful projects.

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Wrought iron, teak and wicker look-alikes will last through umpteen cold snaps, deluges and blizzards.

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