We’re not sure how legit this is, but it’s easy to test out (if you still have an AM radio around). Instructables member RazorG has built a metal detector from just a radio and a calculator. The radio ...

This article was taken from the December 2011 issue of Wired magazine. Be the first to read Wired's articles in print before they're posted online, and get your hands on loads of additional content by ...