There's a Reason For Holes on The Tops of Pen Caps, And It's Surprisingly Awesome
Why do Pens are given with holes in their Cap? - Quora
The Little Known Reason Why There Are Holes in Pen Caps
Do you know why Pen Caps have holes?
There's A Surprising Reason Why Pen Caps Have Holes In Them | IFLScience
Why are pencils yellow? Why do pen caps have holes? These and other wacky facts about writing instruments - YP | South China Morning Post
The Hole Truth About Ballpoint Pens – Now I Know
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This is What the Hole in a Pen Cap Means | Reader's Digest Canada
This is the reason why there's a tiny hole in the top of your Bic pen lid - Mirror Online
Cliff Pickover on Twitter: "The REAL reason why pen caps have holes in them: https://t.co/hLXSnijWAb https://t.co/Po8hk8dALj" / Twitter
This is the reason why there's a tiny hole in the top of your Bic pen lid - Mirror Online
Do you know why Pen Caps have holes?
Why are pencils yellow? Why do pen caps have holes? These and other wacky facts about writing instruments - YP | South China Morning Post
Why Pen Caps Have Holes in Them - ATTN:
Why are these traditional BIC pens holes? – phoneia
Can You Really Clear an Airway with a Ballpoint Pen Like in the Movies?
You'll Never Guess Why Pen Caps Have Holes. This Is Absolute Genius!
If You See a Hole In a Pen Cap, This Is What It Means | Reader's Digest
Design Moment: The Bic Pen, 1938
