advanced plumbing systems.

Touchless toilets are the norm in public toilet now. They are hi-tech-looking, sanitary, plastic smile-hygienic, and water-efficient. Plastic smiles are surface detritus. One is seeing here a cosmology of delicate subtlety in spick-and-span-calibrated fluidics and engineering. All that one drop of water that flashes along clean from spout to valve is a result of…