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A great story, but you are correct about it being apocryphal: https://www.snopes.com/fact-check/the-write-stuff/

Sometimes the simple, old, and reliable tool isn't the best one for your environment.

And one internet binge later, I am now the proud owner of a matte black Fisher 400B Space Bullet Space Pen. Cool story. (The real one, I mean.)

Both used pencils initially, and both switched to this same pen.

Pencils have the disadvantage of putting out conductive graphite dust, which, in 0g, will float around for a very long time.