A 15-minute animation/visualization explaining the human cost of world war 2 - very worth watching and spreading around, in my view
http://io9.com/this-animated-data-vi...ali-1709065880
Even being born in Leningrad, USSR and growing up with constant material (and human) reminders of the war all around me, I always find it incredibly sad and unsettling confronting the sheer scale of what happened, especially in Eastern Europe.