Oh! I just remembered the biggest surprise I had starting out. That rusted metal from containers refines into ferrite, and all the goo and slime refines into runaway mold which then refines into nanites! I sold so so much of that stuff thinking it was just junk before realizing I could have refined it into something useful. Really would have been helpful to know that early on when I was scrounging for nanites to buy technology upgrades.