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

If you've ever traveled to Europe, you might have noticed the different electrical plugs. Here's why European plugs differ ...

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 ...