Thanks for the help everyone. I got another question. There have been quite a few posts on having zero science and I was wondering since you are buying technology that means you are even with all the other civilizations. I have found it very useful to not trade any technology at all because when it comes to war they have musket men and I have infantry making it much easier to destroy them. What is your guys opinion on it?
Of course you shouldn't trade a useful wonder tech if you want to build said wonder, and you shouldn't trade a useful unit tech if you are about to declare war on them. But, by not trading at all you are putting yourself at a disadvantage.
At higher levels you may even consider researching an otherwise useless dead-end tech for the sole purpose of being the only one to know that tech, and thus trade it to the AI at premium price and get multiple tech in return.
Also I finish the game almost always at 2050AD and my science is horrible. If I remember correctly I barely got to the Infantry at that time. Anyone know what to do with the amount I should spend on science and on people happiness? Also what is the best way to earn money in the game so that I may increase my science and people happiness.
the sliders merely divide the total raw commerce (left after corruption) One of the main factors in research power (or gold collecting power if you go for zero research) is how much total raw commerce you produce.
If you want to reach the end of the tech tree before 2050AD (before 1500AD is also possible) you should try to increase your commerce.
The total raw commerce you produce is a function of how many citizens are working on tiles that give any amount of commerce.
To make a long story short: expand,
expand,
expand,
expand!
Just get as many land under your control as possible (without triggering a domination victory) and grow your cities as large as possible.
Road every tile in your empire (the ones worked by citizens first) as fast as possible, and switch to republic for the bonus commerce.
The corrupted cities far away from your capital should be turned into specialist farms, to do this, irrigate everything you can around them, and use the surplus food to support specialist (taxman or scientist)
Last question I was wondering out what percent do you guys keep your spendings on science and people happiness.
I get enough tax to stay in the black, I get enough lux to prevent my core cities from going into disorder, and I put the rest (if there is a rest) into science.
(non-core cities should be kept from rioting with specialist, though if you collect enough lux resources, you may not even need the lux slider at all, anyway.)
I sometimes turn the science slider down to collect gold for a
specific purpose.
I fiddle with the sliders often, I usually check every turn if they need to be fiddled with.