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[–] Fibbideh ago 

The Russians used grease markers when they ran into the dust problem, but of you ever used one you would know it's like writing with a crayon. This means they had to write bigger to make it equally as legible as a pen. This made writing in small portable notebooks a pain in the ass on top of the fact you're creating extra waste with the paper you peel away from the tip.

We did it to make the astronauts' lives easier, not because there was no other option. In space, every little bit counts.