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I remember finding out that a majority percentage of the dust in people's houses are dead skin cells from their own skin.
The mythThe chief ingredient of household dust is human skin; 70, 80 or 99 per cent, in various versionsThe "truth"There seems to be no basis at all for this Well Known Fact – except wishful guesstimating on the part of those advertising copywriters whose job it is to sell us anti-dust devices. There’s no evidence to suggest that dust is mostly made up of any one ingredient; rather, it is a delightful salmagundi or potpourri of everything that is likely to be drifting around your house – cat dander, face powder, cigar ash – or that might be blown in every time you open the door, including soil, pollen, insect excreta, and general industrial pollution. The precise ingredients and proportions present will presumably depend in part on where you live, as well as how – Bognor dust is likely to be sandier than Hackney dust – and on the time of year. Human skin will certainly be on the list, but it is shed chiefly when washing, and therefore disappears down the plughole, not into the dustpan.
Why is this silly story about mattresses full of dust mites (various species of the subclass Acari, to get technical) being bruited about all of a sudden? Because there's a buck in it. Some folks are allergic to dust mites (actually dust-mite feces), and it may make sense for them to buy filters, vacuum cleaners, and other gimmicks that promise to get rid of the little bastards. Most people aren't allergic, but what the heck, if the hucksters can scare the pants off you, maybe you'll buy all that stuff anyway.
... skin shedding old cells while creating new ones ... does it have a natural function?
The shedding of skin is a general means to control the build up flora upon the skin surface.