Derek Muller from Veritasium uses some Google-fu to look into the common claim that dust is mostly dead skin. While a significant amount is, about half of typical household dust in one study was other things like clothing and carpet fibers, pollen, and other small floaty bits. Grossly engrossing!
In addition, he found out that the cloud of dust and microbes that surrounds a person is essentially a fingerprint that can be sampled and used to identify someone (and not just by the DNA in the skin cells). With some of us, it's easier than others.
Image: YouTube / Veritasium