User blog comment:Batran99/Map game 2.0 Idea/@comment-24499539-20140202015828/@comment-24499539-20140202021649

Humph, now I'll expend more... Bronze, Iron, Early Medieval, Late Medieval, Renaissance, Enlightenment, Industrial, Progressive or Atomic, Information, Nanotech/Space. Better!?

I disagree with Modern Era since Progressive/Atomic and Information are same.