Dust Is So Much More Than You Realize

I’ve got a complicated relationship with my Roomba, Keith, who sometimes refuses to charge but also works his wheels off ridding my home of dust. I hate dust, both because I’ve got allergies and because a good chunk of the particulates are toxic microplastics. Modern humans wage an unwinnable battle with dust, which we wipe and sweep and mop—only for it to immediately return. Dust is unseemly, unsanitary, and downright embarrassing for your guests to glimpse.

Why, though? Not that long ago, homes didn’t have glass windows, so the outside just blew inside. People burned wood and coal indoors for heating and cooking, loading the air with black carbon that

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