This set of questions may be a bit too long for this forum, but it's basic, I think. It's all regarding Espionage.
1.) I was going to place the NIA in my capital (where my highest pop and bpt are), but I thought I saw somewhere that you should build it in a city that isn't a threat to be spied on since it doesn't help the city it's placed in. Is this the case?
2.) Do enemy spies ever steal tech from one of your cities OTHER than your capital? I have a city that may be surpassing the capital soon in terms of pop and possibly bpt. Is a spy more attracted to high pop or high bpt (in case that city doesn't exceed the capital's bpt, but it will with pop)?
3.) I noticed that only Arabia and Byzantium were stealing tech from me. I told them to stop, which didn't matter, of course. But I soon ended up in a war with Arabia (unrelated to the spying) in which I battered them pretty badly. After this war, I now possessed the largest army and still a large tech lead, and I've yet to see another Arabian spy dozens of turns later. Byzantium also stopped tech stealing, but note that I also killed one of their spies. Does army size scare away spies? Does killing a spy deter future espionage? Further, do their enemy spies have any awareness of your spies' levels that could thus act as a deterrence?
Thanks in advance for the help!