Took a corona-virus trip down memory lane. Played WoW/NW from 2005-2010 and thought I'd dive back in. There are a few things that escape me after 10 years and the manual doesn't address specifically:

1) Does your required amount of Science to Upgrade a unit vary based on how many you have of the unit currently? Do you need to sell all of a unit before upgrading for a better rate? Or is it standard regardless if you have 0 or 1 million of the unit?

2) I know SAs are 5 turns. Are AR AA and GA also 5 turns?

3) Are multiple states a thing now? Seeing lots of 3-4 man nations that all have similar names and numbers and almost identical build-outs/networth.

4) I see globally there is 1% of built land as CZ - is this a good rule of thumb? If you have 50k land have 500 CZ?

5) The manual says:
Food True 0.001 NA Production on Unbuilt Land: 0.07
Oil True 0.001 NA Production on Unbuilt Land: 0.07

I have unbuilt land that is not generating Food or Oil. Is this incorrect?

Thanks and see ya out there