On: Apartment, completely unused since 1942, discovere...

[pmiller2]

You'd be amazed how little dust accumulates in a place when people don't go there. That's because people are actually the source of most house dust.

[Turing_Machine → pmiller2]

Right. I've heard that a lot of it is actually dead skin.

[ams6110 → Turing_Machine]

That and lint from clothing and upholstery, pet dander, etc. All things that are associated with people living in the place.