Useless machines are a fun class of devices which typically turn themselves off once they are switched on, hence their name. Even though there’s no real point, they’re fun to build and to operate ...

Get unlimited access to ad-free articles and exclusive content. The world’s most useless machine, which is essentially a small electronic box that turns itself off whenever you try to turn it on, ...

Slow day at the office? Here’s a trick that’ll make your coworkers smile. Dangerously Fun has a guide to build a homopolar motor from a battery, copper wire, and magnet. A homopolor motor doesn’t rely ...