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Build Your Own Periscope, Flashlight, and Other Useful Stuff (Edge Books)
Build Your Own Periscope Flashlight and Other Useful Stuff - Edge Books Author:Tammy Enz Make a periscope with some empty milk cartons. Build a pet feeder from empty coffee cans. Create a flashlight with some batteries and spare wire. With just a few things found around your house, you can build all sorts of useful things!