Content creator Zack D. posts “A Collection of Things That I Find Interesting,” and an explanation about why ballpoint pen caps have a hole is apparently interesting to his fans, too.

If You See a Paw-Print Sticker on a Mailbox, Here's What It Means If You See a Blue Line Tattooed on a Dog ... out why there's a little hole in your pen cap and how it helps both you and your ...

One person who responded to the TikToker’s post said that folks can go a step further and use blue ink. “My mother works in Finance. She always made sure I have a pen on me at all time and a ...

The caps of ballpoint pens are perforated to prevent choking accidents. Rating: True (About this rating?) For years, posts on Reddit, X and other platforms have claimed that the reason the tops of ...

The idea of perforating the caps of pens appears to have started in the United Kingdom, where a new safety standard was adopted in 1990 (BS 7272). Between 1970 and 1984, nine children in the ...

The idea of perforating the caps of pens appears to have started in the United Kingdom, where a new safety standard was adopted in 1990 (BS 7272). Between 1970 and 1984, nine children in the ...