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

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 ...