Apologies if this is nothing new. City management allows you to turbocharge scientific research. The key is that you can cycle through your cities using the left and right arrow keys. You can do this during your turn and also when the program is processing between turns. When you finish your turn, the program calculates the scientific research first before doing anything with any of the cities. Once that is done it goes about the housework of adding food, shields, and money in the cities. It runs through the cities in the same order every time. Playing the Celts, it does Entremont first, then Alesia, and so on in the order that you built the cities. At the end of my turn I check my cities to see if anything is 1 turn away from completion. Let's say Entremont is about to build a spearman. I go to all of my cities other than Entremont and change every citizen into a scientific researcher. That runs the research numbers way up. I finish the turn and when the program pops up Entremont on the next turn with the completed spearman, I use the left and right arrow keys to cycle through the cities and change all the citizens back to what they normally would be. After doing so, I continue with the turn changeover as normal and all of the cities get the benefit of the citizens working the land tiles as if I had never changed them to scientific research. The same thing can be done with other cities finishing a building project, but you can only do the cities that were built after the city in question. I haven't tried this all the way through, but it's working nicely in the ancient era. One caveat though, is that you have to sure to cycle through the cities to get the people back on the land tiles before continuing on during the turn changeover. If you fail to do this, you lose everything from land production. TL;DR Nice exploit in city management to speed scientific research. Again, apologies if this already known.