>_>
1. How do you find out if a country has already researched something like this?
I don't even remember many of my own results, for example. But actually, I've already encountered all of this, even things that aren't even in NS!
2. If something has already been researched on NS and, as a result, boosted NTP, then why should it allow you to research something else?
3. Balance.
4. The idea is that if you researched something on NS and want to see it in your country, you can buy it from this list.
Yes, I'm going to freeze the stats (we've already discussed this) for an indefinite period and make the game more interactive.