My workers seem to be on double-time all of a sudden. I'm playing in 'Regent' mode and my government type is currently at Democracy. Suddenly my workers are clearing pollution with 2 workers and completing railroads and mines using 1 worker in 1 turn. I have been playing quite a while and never seen this. It's great, but anybody know what's happened?? (In the past it's been roads in 1 turn, railroads in 2, and pollution is 4 workers in 1 turn)