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Why are pencils yellow? Why do pen caps have holes? These and other wacky facts about writing instruments - YP | South China Morning Post
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This is the reason why there's a tiny hole in the top of your Bic pen lid - Mirror Online
You Know That Little Hole in Your Pen Cap? It Could Save Your Life | Gear Patrol
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Why Do Pen Lids Have Holes
People are only realising now why biro pens have holes in the lids - JOE.co.uk
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Why do BIC pens have a hole in the lid? | The Independent | The Independent
