I found a cool way to get tons of money while still researching those techs at a pretty good rate. When ever you have one turn left to research the tech, go to the advisor screen and turn down science to 10%. Most of the time, not always, it will let you bring it way down and still only have one turn left making your surplus go way up for that one turn! Then as soon as you get the tech just go back and pump up the science! This works real well I am finding and I am for the most part keeping up with the other civs.
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