Ancient Era[]
Agriculture
Animal husbandry- Bronze working
- Calendar
- Construction
- Fishing
- Military Theory
- Mining
- Pottery
- The wheel
- Trade
- Trapping
Classical Era[]
- Currency
- Drama and poetry
- Engineering
- Iron working
- Masonry
- Mathematics
- Metal casting
- Philosophy
- Sailing
- Writing
Medieval Era[]
Renaissance Era[]
- Acoustics
- Architecture
- Astronomy
- Banking
- Chemistry
- Economics
- Gunpowder
- Metallurgy
- Navigation
- Printing press
Industrial Era[]
- Archaeology
- Dynamite
- Fertilizer
- Industrialization
- Military science
- Railroad
- Rifling
- Scientific theory
- Steam power
Modern Era[]
Atomic Era[]
- Atomic theory
- Combined arms
- Computers
- Electronics
- Nuclear fission
- Penicillin
- Radar
- Refrigeration
- Rocketry
Information Era[]
