Hole in pen cap
Have you ever noticed that there is a hole in pen caps? This is designed with a very useful purpose in mind. Many children (and sometimes adults) put pens in their mouths. If it happens that the cap is accidentally swallowed, the hole ensures that you can continue to breathe. This gives the paramedics just enough time to prevent suffocation. Super important and well thought out!
You’ll find more tips and facts on the next page.