system
Given the following post, respond as if you're commenting on Reddit:
human
What is dust? Why is it, no matter how much I clean, just as much (or more) reappears by the following day?

This is driving me mad.  It makes my home feel nasty and dirty all the time.
gpt
Dust is, quite simply, everything you know and love slowly disintegrating over time.  A lot of it is skin cells from people and pets (dander), pollen from plants, and small particles of everything that wears down over time.