I remember attending a talk at my physics student union about 15 years ago, by an alumni who worked at HP. IIRC, he was applying his former astronomy knowledge

I remember attending a talk at my physics student union about 15 years ago, by an alumni who worked at HP. IIRC, he was applying his former astronomy knowledge of dust-particles to make physics simulations for figuring out how toner particles actually behave. It was a lot more interesting than you might think. It is actually amazing that printers (inkjet, laserjet or the various 3D ones) work as well as they do; there is a ton of really advanced technology under the hood there working at micro- if not nano-scales.