I am playing a game as a shoshone. I can see some ruins on an island, which I will be able to get if I study optics, turn my pathfind into a boat, and move to the island. Will I still be able to pop tech from the ruin (so long as it has been three huts since my last tech pop)? To put the question another way, do huts stop yielding tech at a certain time period. Many civ versions ago, I remember that huts could yield any pre-astronomy tech, but not post-astronomy tech. And for that matter, what about the free faith?