They are borderline exploits that you don’t really need to know unless you want to break the game in kind of unfun ways. You probably wouldn’t find them on your own. But for completions sake the LDS shuffle is Space Age specific and it involves stacking a ton of low density structure productiviy bonuses to create a lossless recycling loop that breaks the quality system severely. Fluid voiding is a way to automatically delete unwanted fluids (you can do it in vanilla or space age). You can always manually delete fluids but by design you can’t automate that process - except you can actually do it by exploiting a combination of behaviors.