when I was a kid my dad and I made a compass out of a magnetized razor blade (http://www.linkthink.co.za/wp-content/uploads/2007/03/435178-razor-blade.jpg) + needle + eraser (somehow I'd forgotten this).
Incidentally, I still have no idea how this kind of blade can be used for shaving.
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Incidentally, I still have no idea how this kind of blade can be used for shaving.