system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What are those dust motes we see floating around made of? How do they form?
gpt
Most of the dust particles that you see wafting around in the sun are organic. These come from plants or animals that have dried out and can break down into smaller and smaller pieces over time. Because these eventually very tiny bits are usually not made out of heavy atoms like the kind that are in rocks and stuff, dust from organic sources is often very light, and so it pretty much floats given the lightest whiff or current of air.

Humans and their hairy pets produce a lot of dead flakes of skin and tiny bits of hair that really can contribute to household dust. The next time you have a thin sliver of sunlight coming into where you live, some of the bits that are floating around in there... are very likely yours.