Last weekend we got a large tin of Tinker Toys at a yard sale. The kids really enjoyed talking into the empty can, which gave me the idea that we should make tin can telephones. Yet another thing I remember doing as a kid. It’s so fast and easy too. Just open a can of food. (I really recommend a smooth-edge can opener of some sort, so there are no sharp edges.) Then use a hammer and nail to poke a hole in the can. Connect the two cans with some string. (Tie a knot on the string inside the can.) And done! I taped on some strips of colored paper to add a little more visual excitement. They were pretty impressed with how it all worked. Never too early for a science lesson!
Above is a photo of a smooth-edge can opener. A very brilliant invention.