The hole in pen caps is a perfect example of thoughtful product design. What seems like a small and insignificant feature actually plays an important role in protecting people.
Next time you pick up a pen, take a closer look at the cap. That tiny hole is not just a random detail — it’s a life-saving innovation hidden in plain sight.
Fun Fact:
Many everyday items around us contain hidden design secrets just like this one. From soda cans to phone chargers, small details often have surprisingly clever purposes.
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