
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


