Hydrophobic liquid could be of interest for industry. Consider multiple narrow tubes of this liquid suspended in water, robustly refusing to merge with each other or with the surrounding medium. The medium could flow in one direction and the tubes in another, for great improvements in heat exchange and extraction of dissolved substances from one medium to another. This idea requires some workshopping, of course--I've found that a narrow channel can flow stably in a laminar phase, but any degree of turbulence chops it up into into its preferred fine-powder phase. This minimum-height machine provides a quick way to produce a narrow channel for anyone interested in pursuing this idea.

Also, peep the calcinator that solves two problems for me at once.

- Alchemist Kazyan