Maybe it`s a question of economics? In Civ 5, this would happen sometimes, but they would also ask for gold to calculate the cost of the research agreement. But they don`t do it here, and the cost of the research agreement has changed. So I was confused, as in previous versions, cities remain the central pillar of civilization gameplay. A city can be based on a place desired by a unit of settlers manufactured in the same way as military units. The city will then increase in population; Manufacturing units and buildings; And create research, wealth and culture.  The city will also expand its boundaries by one or more tiles at a time, which is essential to the need for territory and resources. The expansion process is automated and adapted to the needs of the city, but the tiles can be purchased with gold.   I made a research agreement with an AI at Civ 5, and when it was halfway there, he attacked me. Has that money disappeared for both of us, or can we take it back as soon as I teach him a lesson? Civilizations can no longer trade with technology, as in previous versions of the game, but civilizations can carry out common technological ventures. Two civilizations at peace can form a research agreement that requires an initial investment of gold and provides the two civilizations with a certain amount of science as long as they remain at peace.  Before the PC 126.96.36.1992 version of the game, civilizations were equipped with unknown technology after a series of twists and twists of uninterrupted peaceful relations.
Players acquire technology by amassing ”science” which represents the amount of science a civilization possesses. Every tower of a civilization produces a lot of science that can be used for research. Each technology costs a certain science to learn; The more science is generated, the shorter the time it takes to find each technology. Players can also source technology from some tribal villages. It is not guaranteed, but it is another good reason to search them and say before someone else does. Most technologies have an ”Eureka” lens/bonus. This bonus is a kind of quest (such as ”Meet another Civilization” or ”Build a Quarry”) that, when completed, grants a research credit worth 50% of the science that was previously needed to unlock this technology. Players can get the research credit, whether or not they explore the technology in question. (That`s what I discovered after I started the game and tried a lot of different keys) As in previous versions, cities remain the central pillar of civilization gameplay.