Biology
Prerequisite Techs: Archaeology, Scientific Theory
Leads to Techs: Electricity
Unlocks: Hospital, Oil, Oil Well
Combustion
Prerequisite Techs: Replaceable Parts, Railroad
Leads to Techs: Atomic Theory, Lasers
Unlocks: Tank, Panzer
Dynamite
Prerequisite Techs: Fertilizer, Rifling
Leads to Techs: Combustion
Unlocks: Artillery
Electricity
Prerequisite Techs: Biology, Steam Power
Leads to Techs: Refrigeration, Telegraph, Radio
Unlocks: Stock Exchange, Aluminum, Destroyer
Flight
Prerequisite Techs: Replaceable Parts
Leads to Techs: Radar
Unlocks: Carrier, Fighter, Zero
Radio
Prerequisite Techs: Electricity
Leads to Techs: Radar, Mass Media
Unlocks: Anti-Aircraft Gun, Broadcast Tower, Eiffel Tower
Railroad
Prerequisite Techs: Steam Power
Leads to Techs: Combustion
Unlocks: Arsenal, build Railroads
Refrigeration
Prerequisite Techs: Steam Power, Flight, Combustion
Leads to Techs: Plastics, Penicillin
Unlocks: Submarine, Offshore Platform
Replaceable Parts
Prerequisite Techs: Steam Power
Leads to Techs: Flight, Combustion
Unlocks: Anti-Tank Gun, Infantry, Foreign Legion, Statue of Liberty
Steam Power
Prerequisite Techs: Scientific Theory, Military Science
Leads to Techs: Electricity, Replaceable Parts, Railroad
Unlocks: Ironclad, Factory, Lumbermill Production increased by 1, faster Embarked movement
Telegraph
Prerequisite Techs: Electricity
Leads to Techs: Electronics
Unlocks: Battleship, Military Base, Cristo Redentor
