Today we call it "recycling" and aluminum cans are found in our recycle bins and only a few "tin" cans. Back during WWII, there were no aluminum cans and tin cans were the standard packaging method. So, all you young whippersnappers out there in glover320 blogspot land, let me tell you about those World War II scrap drives we had. There was a process that we all followed. First, we washed the inside of the can to remove any food residue. Next, we peeled off the paper wrapper on the can. Then, opened the other end of the can, removed the lid, placed it on a flat surface, inserted the lid into the cylindrical can, and stepped on it, thus rendering it a "flattened tin can." Did you get all that?