system
Given the following post, respond as if you're commenting on Reddit:
human
If everything is made out of particles, wouldn't words written on a piece of paper eventually shift?

Wouldn't the particles move around causing the ink/lead to shift?
gpt
There are materials in which the particles are free to shift around arbitrarily; they're called fluids, and we don't generally write things in them that we need to last. What makes a material solid is that the particles *aren't* free to drift however they please, but constrained by the particles around them, offering a much better environment for lasting writing.