The Roman Empire and the Mongol Empire at their height. The maximum population of the Roman Empire was around 75 million, or 20 people per square kilometre. The Mongol Empire at its peak reached 100 million, or around 3 people per square kilometre.
Today the population density of Europe is around 85 people per square kilometre, and that of Russia around 9.
At the close of the Strugatskys' "Roadside Picnic" the Golden Sphere is asked for this: "Happiness for everybody, free, and let nobody go away unsatisfied!" I do not promise to leave no one aggrieved, but the digest really does come free. So, here is the
Frederic Leighton. “Daedalus and Icarus”, 1869 Daedalus warns his son not to climb too high: the heat of the sun may melt the wax, but Icarus is already gazing into the distance, and the lamentations of a foolish old man interest him not in the least
