Agriculture
Prerequisite Techs: None
Leads to Techs: Pottery, Animal Husbandry, Archery, Mining
Unlocks: Farm
Animal Husbandry
Prerequisite Techs: None
Leads to Techs: Trapping, The Wheel
Unlocks: Horses, Pasture
Archery
Prerequisite Techs: None
Leads to Techs: Mathematics
Unlocks: Archer
Bronze Working
Prerequisite Techs: None
Leads to Techs: Iron Working
Unlocks: Spearman, Hoplite, Persian Immortal, Barracks, The Colossus, Krepost, remove Jungle
Calendar
Prerequisite Techs: None
Leads to Techs: Theology
Unlocks: Stonehenge, Plantation
Masonry
Prerequisite Techs: None
Leads to Techs: Construction
Unlocks: Walls, The Great Pyramid, Quarry, clear a Marsh
Mining
Prerequisite Techs: None
Leads to Techs: Masonry, Bronze Working
Unlocks: Mine, remove Forest
Pottery
Prerequisite Techs: None
Leads to Techs: Sailing, Calendar, Writing
Unlocks: Granary
Sailing
Prerequisite Techs: None
Leads to Techs: Optics
Unlocks: Work Boat, Trireme, The Great Lighthouse, Fishing Boats
The Wheel
Prerequisite Techs: None
Leads to Techs: Horseback Riding, Mathematics
Unlocks: Chariot Archer, Egyptian War Chariot, Naresuan's Elephant, Water Mill, Floating Gardens, build a Road
Trapping
Prerequisite Techs: None
Leads to Techs: Civil Service
Unlocks: Trading Post, Camp
Writing
Prerequisite Techs: None
Leads to Techs: Philosophy
Unlocks: Paper Maker, Library, National College, The Great Library, Open Borders
