An education video describing how the cool technology of superconductors in magnetic levitation works.

A lot of people have been impressed with how you can find an app for everything. What about driving your car? With this (very) ambitious DIY project you can drive a car with your iPhone.

When you’re tinkering, especially on a project with tiny screws, it can be intensely frustrating to have a screw disappear into the carpet or inside your project. Temporarily magnetize your screwdriver with this simple trick.

Instructables user Larry SDonald found that magnetized screw drivers were handy but they have the downside of being unsuitable for working around magnetically-sensitive equipment. His solution to the problem—rather than buying duplicates of all his tools in magnetic and non-magnetic models—was to simply attach a small neodymium magnet to the shaft of non-magnetic screw drivers to impart a temporary and powerful boost.

Once you remove the magnet the magnetism dissipates and the tool is rendered non-magnetic again. Have your own handy tool hack? Let’s hear about it in the comments below.

Unlock your door with a secret knock. More information, source and schematics at http://grathio.com