Watch a macro video of how a ballpoint pen rolls across the paper
I’ll be the first to admit that I’ve never thought about the inner workings of a ballpoint pen. After all, how complex can it actually be? Well, as it turns out, a ballpoint pen is quite complex, and there’s so much about them we don’t know (that’s actually quite interesting). For starters, the ball of a ballpoint pen is almost as hard as a diamond! It holds the ink inside the pen until it’s rolled across paper, then it rolls out a film of ink which the fibres of a sheet of paper pick up. Even if you think ballpoints are as boring as hell, watching them close up will give you a new appreciation for all your writing tools lying around the house.