Discover how to build a simple electric train using just a copper coil, an AA battery, and disc magnets in this step-by-step ...

Making an electromagnet is as simple as wrapping some wire around a nail and taping the wire to both ends of a battery. When you’re done, you can pick up some paper clips – it demonstrates the concept ...

If there’s something more tedious than winding coils, we’re not sure what it is — possibly rolling and wrapping coins; that’s really a bother. But luckily, just like there are mechanical ways to count ...

We've previously covered how to make a "speaker" from earbuds and paper cups but if you don't have a pair of donor earbuds handy or just want to learn how to build basic speakers from scratch you can ...