The holes on the prongs of your electrical plugs may look random, but there's a clear reason they were created and why they ...

The US uses two standard electrical plug types: Plug Type A and Plug Type B. Both have two parallel pins for power, while the latter has an additional grounding pin for safety. But if you look closely ...

close up of Type A plug prongs - Gabriel Lopez/Shutterstock If you've ever stared at the holes in an electrical plug and wondered why they exist, you're not alone. Like an industrial-age kōan, the ...

Spark plugs are necessary for gas-powered engines. However, they're not all the same, and they can come in different shapes ...