Tin Can Telephones

Last weekend we got a large tin of Tinker Toys at a yard sale.  Jack and Tess 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.  Jack and Tess 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.