In a hard-to-reach area, it can be frustrating to place a nut properly when you need to thread on a bolt from the other side. Here’s a slick trick. Glue a small rare earth magnet to the end of a paint ...

What if the strings of a guitar could float, untethered, held in place by nothing but invisible magnetic forces? It sounds like the stuff of science fiction, but Mattias Krantz outlines how he turned ...