Okay, from a strictly chemical point of view, 3M's Novec 1230 isn't the plain old dihydromonoxide we have known of old... but that is a good thing.
This fascinating liquid (video here) evaporates with incredible speed, does not conduct electricity and is apparently non-toxic. Perfect for, say, filling vulnerable voids in a home-made U(nderwater)AV to pressure proof 'em, or having a weirdly dry water fight.
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