Add Yahoo as a preferred source to see more of our stories on Google. close up of Type A plug prongs - Gabriel Lopez/Shutterstock If you've ever stared at the holes in an electrical plug and wondered ...

Add Yahoo as a preferred source to see more of our stories on Google. Most gadgets and small appliances in U.S. homes have either a Type A or Type B electrical plug, perhaps with a cover to hide cords ...

If you've ever looked closely at an electrical plug, you've likely noticed that the ends of the prongs have little holes in them. While this is a leftover design element from early electrical systems, ...

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 answer is anything but straightforward. A quick search will ...

Add Yahoo as a preferred source to see more of our stories on Google. If you've ever looked closely at an electrical plug, you've likely noticed that the ends of the prongs have little holes in them.