Adds a nuclear isotope industry. Polonium, cobalt, strontium, yttrium and californium cartridges are needed for science, rockets and more. With or without Space Age enabled, but you need to own it.
Mods introducing new content into the game.
Counted when a user downloads a mod release for the first time. Before Nov 2021 it counted everytime a user clicked the mods download button.
Counted when a user downloads a mod for the first time. Has no data before Dec 2022