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RE: World made out of metal: Aluminium
One of my favourites fun facts about aluminium is that during WWII America began recycling with an iniciative called “Tin foil drives” Were they gave the people free movie tickets in exchange of aluminum foil balls. This was great for the morale of the people, who felt were contributing with their armys effort in war.
That's pretty cool, a bit sad, but such a great initiative!