People have been left stunned after discovering the real reason that biro pen lids have a hole in the top of them. Zach D, a popular American filmmaker who boasts 20 million subscribers on , posted a video revealing the truth in 2022 - shocking people across the internet with the revelation. In the short clip, he said that while most people believe the reason is related to the ink, the holes in pen lids have a far more crucial function.
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