The reason most electrical plug prongs have holes in them

If you've ever looked at the end of a plug, you've probably wondered why some have holes, and some don't - and no, it's not actually a big conspiracy theory.

If you&#39;ve ever looked at the end of a plug, you&#39;ve probably wondered why some have holes, and some don&#39;t - and no, it&#39;s not actually a big conspiracy theory.<p><img src="https://www.engadget.com/img/gallery/the-reason-most-electrical-plug-prongs-have-holes-in-them/intro-1792780954.jpg" /></p>