Blowing up Cities: Blowing up too many cities will give you a few hints, until you are threatened of having the health bar reduced to a pixel. The threats are not empty... To do this, blow up about 10 or more buildings.

Health: You're health will be greatly reduced to approximatly 5%, but after either quitting the game, or coming back later (exact time unknown) the health bar will go back up to 5. Destroying more cities will put it back down once more.