What I have never understood is concrete it is mostly made up from silicon and carbon? The typical concrete mix is made up of roughly 10% cement, 20% air and water, 30% sand, and 40% gravel. So where does the crazy mix in the game come from. I have never understood why something as simple as concrete is not simple to make in game. You have an easier time making pure metal building materials than you do concrete. Am I the only one thinking this? Concrete should be a base building material that is so heavy that it would not be practical to use as a ship material. And not take 3 unrelated refined materials to make. Refine dirt into pure materials and then into concrete and make those refined materials limited to just a few things. Anyway just my thoughts.