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Here's a guy who made a 4-bit adder through water[0]. Creating a computer through water seems to be really doable. I'd be interested to watch more stuffs like this.

[0] - http://www.blikstein.com/paulo/projects/project_water.html

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Back in the late 80s or early 90s there was a group working on this a a backup for military planes. The thought was the "water" (they used some oil like fluid and machined metal blocks for the gates) wouldn't be susceptible to EM pulses and could keep a plane in the air if hit with a pulse weapon.

I believe it was abandoned because solid state ICs grew way too quickly and outpaced the ability of the liquid ICs to keep up.

"Liquid IC" as a pun on "solid state" is quite fun.

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