Question: When aluminum is exposed to oxygen, a very thin layer of aluminum oxide forms on the outside. Aluminum oxide is a good insulator. Nevertheless, if

When aluminum is exposed to oxygen, a very thin layer of aluminum oxide forms on the outside. Aluminum oxide is a good insulator. Nevertheless, if two aluminum wires are twisted together, electric current can flow from one to the other, even if the oxide layer has not been cleaned off. How is this possible?

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