tierso

I'm curious..what's the purpose of Oxygen-18? Is there any in-game use? This is the only place where Oxygen-18 is mentioned in KSP context..

I have this problem with one of the small thermal control systems that I was suddenly unable to move around or do anything with, after I detached it. I had to put it in inventory to "get my kerbal rid of it". I suddenly started exceeding weight limit although when I hover it it's got the same weight value as the other thermals that I can manipulate freely.