| REQUIRES: | SCIENCE: | ALLOWS: | |
| flight & electricity | advanced flight | rocketry | |
| alphabet | * | code of laws & mapmaking & mathematics & writing | |
| mysticism & mathematics | astronomy | * | theory of gravity & navigation |
| theory of gravity & physics | atomic theory | nuclear fission | |
| combustion & steel | automobile | + | mass production |
| trade & the republic | banking | * | industrialization & the corporation & the republic |
| construction & iron working | bridge building | * | railroad |
| bronze working | * | currency & iron working | |
| ceremonial burial | * | monarchy & mysticism | |
| university & medicine | chemistry | + | explosives & refining |
| horseback riding & feudalism | chivalry | ||
| alphabet | code of laws | * | literacy & monarchy & the republic & trade |
| refining & explosives | combustion | + | automobile & flight |
| philosophy & industrialization | communism | labor union | |
| mathematics & electronics | computers | robotics & space flight | |
| the republic & explosives | conscription | the republic | |
| masonry & currency | construction | * | engineering & bridge building |
| bronze working | currency | * | construction & trade |
| philosophy & literacy | democracy | recycling | |
| metallurgy & magnetism | electricity | advanced flight & electronics | |
| engineering & electricity | electronics | computers & nuclear power & rocketry | |
| the wheel & construction | engineering | * | electronics & invention |
| gunpowder & chemistry | explosives | + | combustion & conscription |
| masonry & monarchy | feudalism | chivalry | |
| combustion & physics | flight | advanced flight | |
| nuclear power & superconductor | fusion power | ||
| medicine & the corporation | genetic engineering | ||
| invention & iron working | gunpowder | + | explosives & metallurgy |
| horseback riding | chivalry | ||
| railroad & banking | industrialization | + | communism & steel & the corporation |
| engineering & literacy | invention | * | gunpowder & steam engine |
| bronze working | ironworking | * | bridge building & gunpowder |
| mass production & communism | labor union | ||
| writing & code of laws | literacy | * | invention & democracy & philosophy & the republic |
| navigation & physics | magnetism | electricity | |
| alphabet | map making | * | navigation |
| masonry | * | mathematics & construction & feudalism | |
| automobile & the corporation | mass production | labor union & nuclear fission & recycling & superconductor | |
| alphabet & masonry | mathematics | * | astronomy & computers & physics & university |
| philosophy & trade | medicine | + | chemistry & genetic engineering |
| gunpowder & university | metallurgy | + | electricity & steel |
| ceremonial burial & code of laws | monarchy | feudalism | |
| ceremonial burial | mysticism | * | astronomy & philosophy |
| mapmaking & astronomy | navigation | * | magnetism & physics |
| atomic theory & mass production | nuclear fission | nuclear power | |
| electronics & nuclear fission | nuclear power | fusion power | |
| mysticism & literacy | philosophy | + | communism & democracy & medicine & religion & university |
| mathematics & navigation | physics | * | atomic theory & flight & magnetism & steam engine |
| refining & spaceflight | plastics | robotics & superconductor | |
| pottery | |||
| steam engine & bridge building | railroad | * | industrialization |
| mass production & democracy | recycling | ||
| chemistry & the corporation | refining | + | combustion & plastics |
| philosophy & writing | religion | plastics & computers robotics | |
| advanced flight & electronics | rocketry | space flight | |
| computers & rocketry | space flight | plastics | |
| physics & invention | steam engine | * | railroad |
| metallurgy & industrialization | steel | + | automobile |
| plastics & massproduction | superconductor | fusion power | |
| banking & industrialization | the corporation | + | genetic engineering & mass production & refining |
| code of laws & literacy | the republic | + | banking & conscription |
| the wheel | * | engineering | |
| astronomy & university | theory of gravity | atomic theory | |
| currency & code of laws | trade | + | banking & medicine |
| mathematics & philosophy | university | + | chemistry & metallurgy & theory of gravity |
| alphabet | writing | * | literacy & religion |
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