There are currently eight different technologies available to research. The time to research them and the abilities they unlock are as follows --
Ancient Chants (11 seasons) -- unlocks Monument building (increases culture), and leads to Education and Mysticism technologies.
Masonry (16 seasons) -- unlocks Quarry improvement (requires stone or marble resources), unlocks Dungeon building (decreases crime rate and war unhappiness), unlocks Stone Walls building (increases city defense), and leads to Construction technology.
Mining (21 seasons) -- unlocks Mine improvement (requires any hills tile), enables workers to chop down forests (increases production), reveals Copper resource, and leads to Archery and Bronze Working technologies.
Calendar (18 seasons) -- unlocks Plantation improvement (requires silk, dye, banana, incense, or reagents resources), unlocks Agrarianism civic (increases health and food from farms), and leads to Festivals technology.
Fishing (18 seasons) -- enables water tiles to be worked, enables trade along rivers, unlocks Work Boat unit, unlocks Heron Throne world wonder (increases production from water tiles), unlocks Fishing Fleet improvement (requires fish, clam, crab, or whale resources), and leads to Sailing technology.
Horseback Riding (41 seasons) -- unlocks Stables building (allows recruitment of Horsemen, Horse Archers, and Knights units if we have horses resource), allows captured elephants to be upgraded to War Elephants, and leads to Trade technology.
Cartography (23 seasons) -- enables Open Borders in diplomacy, unlocks City States civic (decreases maintenance costs and culture), unlocks Project of the Nilhorn project (gives 3 free Hill Giant units), and leads to nothing.
Hunting (52 seasons) -- unlocks Camp improvement (requires deer, fur, or ivory resources), unlocks Hunting Lodge building (allows recruitment of Hunters, Hawks, and Assassins units), and leads to Animal Handling, Poisons, and Archery technologies.
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