I've been RA blocking quite a lot, and have come up with a theory, the truth of which I am unsure. The only evidence I have is anecdotal, but it seems to me that if there are multiple techs with zero research, the one that you'll get is the one you research going into the end of the RA. So if I've got a RA expiring at the end of turn 270, and both, say, Plastics and Penicilin have 0 research at the beginning of that turn, if I chose to research Plastics for that turn, that's the tech I will get from the RA. Again, this is just a theory, but it has worked for me a good three of four times since I started getting suspicious about it. Possible coincidence. Can anyone confirm or deny this?