1600-1700 is the second part of the Renaissance Era. This is levels 4-5. The last century is levels 6-8. The timeline for this era: Column 1 Date Tech Event 1600 Corporation English East India Company chartered 1610 Flintlock Flintlock invented 1620 Mercantilism Mercantilist writings in England 1637 Scientific Method Descartes publishes Discourse on the Method 1643 Weather Forecasting Barometer invented 1651 Social Contract Hobbes publishes Leviathan 1653 Naval Tactics Line of battle techniques developed 1661 Chemistry Boyle publishes the Sceptical Chymist 1687 Physics Newton publishes Principia 1688 Explosives Grenadiers during Glorious Revolution 1689 Liberalism Locke writes Two Treatises of Government 1698 Stock Brokering English Stock Exchange founded This plays out as follows: Renaissance-4 contains some pivotal technologies. Column 1 Tech Old Prerequisites New Prerequisites Corporation Constitution + Economics Jurisprudence Flintlock Chemistry + Leadership + Matchlock Cavalry Tactics + Metallurgy Mercantilism Banking + Divine Right + Navigation Divine Right + Navigation Scientific Method Astronomy + Chemistry + Printing Press + (Economics OR Physics) Astronomy + Clockworks + Divine Right + Printing Press Social Contract Humanism + Jurisprudence + Liberalism Divine Right + Jurisprudence What I did: Corporation is a difficult technology to pin down. I decided to move it to one of the earliest examples of a joint-stock company with the English East India Company, and picked prerequisites that matched it. Flintlock changed because I don't think Chemistry is necessary to a flintlock (it would be if we had a separate tech for caplock guns, but that's not nearly broad enough for a technology), especially with Chemistry headed to the other side of Scientific Method. However, I wanted some distance between Matchlock and Flintlock, and settled on requiring Metallurgy and Cavalry Tactics. Another possible prerequisite option would be Matchlock AND Metallurgy AND (Cavalry Tactics OR Naval Cannon). In this case, you can get to Naval Cannon without Matchlock, so I would specifically require it. Mercantilism simply lost Banking, as it was redundant. Scientific Method mostly loses prerequisites; I wanted Chemistry, Economics, and Physics all on the far side of this tech. Clockworks felt right to add, and Divine Right keeps Scientific Method on its proper side of the 1600's dividing line. There weren't really any other appropriate options. Social Contract is another tech that's switching places; in this case, it's exchanging places with Liberalism. Humanism moved so far back that it was redundant; Divine Right beefed up the prerequisites a little more. Renaissance-5 contains the key science techs of Chemistry and Physics, as well as a few other techs, and it's one of the few levels with two techs that can be turned off (Stock Brokering requires the Advanced Economy option, and Weather Forecasting requires the Meteorology option) Column 1 Tech Old Prerequisites New Prerequisites Chemistry Metallurgy Metallurgy + Scientific Method Explosives Flintlock + Scientific Method Flintlock + Mountaineering + Scientific Method Liberalism Divine Right + Humanism + Printing Press Scientific Method + Social Contract Naval Tactics Flintlock + Naval Cannon + Navigation Flintlock + Naval Cannon + Navigation Physics Education + (Algebra OR Astronomy) Scientific Method Stock Brokering Corporation + Jurisprudence Corporation + Mercantilism Weather Forecasting Astronomy + Cartography + Weather Lore Cartography + Scientific Method + Weather Lore Changes to this level: Chemistry adds Scientific Method. It is the scientific method that differentiates chemistry from alchemy. Explosives gives Mountaineering a tech to lead to. This was the best fit available. Liberalism changed places with Social Contract. It also gained Scientific Method because I want to stay away from techs with just one prerequisite. I feel that techs with just one prerequisite could be folded into said prerequisite. Physics gets Scientific Method as the best option I can find. Like Chemistry, I want this tech on the far side of Scientific Method, but unlike Chemistry, there aren't any good non-redundant additional prerequisites. Stock Brokering replaces a redundant Jurisprudence with Mercantilism. Weather Forecasting starts to really take off after the scientific method introduces experimentation. The barometer was just one option of several events that I could have used to date this technology. So that's part two. Part three will cover the last nine techs of the Renaissance.