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Research allows one to access new technologies. A library, university or research centre (depending on your age) is required to do research. The research is divided into ages. Bear in mind that once you go two ages ahead of the possible research option, it will be locked so it is recommended to research as much as you can before advancing too far (you will only be able to research technology from the age before yours). Also, only one technology can be researched at a time even if you have more then one research facility. However, more and/or higher leveled research facilities do decrease the time it takes to do research.
Researching can:
- Increase the amount of resources gain
- Give you access to new units and buildings
- Lower the trading time
- Improve specific or all units
- Lower the building time
- Allow you to build on specific resource tiles
- Allow you to make (aditional) settlements
- And get you many more advantages!
Often, one kind of research requires another. The technologies unlocked often are linked, so for example a sawmill will grant you access to the research of springboards, both increase the amount of wood you gain. This is known as a techtree.