They come in a variety of shapes and sizes. Some of them are slim and easily recognizable as such, they can look clumsy or elegant, others are shaped like a flying saucer. In our advanced age, some of them even have a brain and — almost — a life of their own. Although at some point they also need a human hand, so they can start work: vacuum cleaners.
The food of vacuum cleaners is dust which, as any electronic microscope reveals, also comes in a variety of shapes and sizes, both organic and inorganic: dead skin cells, paper fibers, dust mites, synthetic fibers, grains and pollen, and in some cases coal dust, asbestos or other harmful particles. The best way to see airborne dust is to observe a room flooded with light. It’s more fashionable these days to talk about microbes that live all over our bodies, bombard us with their genes and are even a part of dust. This is where scientists are on the front lines of discovery. But let’s stay with plain, classic dust for a minute or two. More… “Dust Never Sleeps”