New top story on Hacker News: What Is the Transparent Material at the End of a Gel Pen Refill?

New top story on Hacker News: What Is the Transparent Material at the End of a Gel Pen Refill? New top story on Hacker News: What Is the Transparent Material at the End of a Gel Pen Refill? Reviewed by Qamar javed on May 02, 2021 Rating: 5

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