Hi!
the only tech for extreme colonization I can get anything for in the trade screen is aquatic/advanced aquatic
If there are no more (let's say) radioactive planets to colonize, or are those planets deep in other's zone of infuence (so planet will "flip"), is that tech worthless to an AI. So you need to sell that tech aroud BEFORE you colonize the last lone rad planet.
BR, Iztok