I recently saw a post where someone said they would never use F10 because it was an exploit of the game. For those few who don't know, at the beginning of the game you can find out who your opponents are by pressing F10, which brings up the space race status. There is a tab you can hit with "view space race". There you will find a list of your opponents. I say it is only an exploit right then. My reasoning is, all that information is freely available after only 20 turns, with the "History of The World" pop-up(Wealthiest Nation, Largest Nation, etc.). I think it only lists 8, so on a larger than standard world, it remains an exploit. I have no problem with it after 3000 BC.