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This is some obscure knowledge haha. You got more? And a newsletter?
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This is a well-known fact. https://www.sciencealert.com/why-there-are-holes-in-tops-of-pen-caps-lids-bic
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pull down to refresh
This is some obscure knowledge haha. You got more? And a newsletter?
This is a well-known fact. https://www.sciencealert.com/why-there-are-holes-in-tops-of-pen-caps-lids-bic
They did have to add a hole at the top of the cap in 1991