In his most recent video to go viral, Hank Green of the Vlog Brothers discusses a slew of maps, 42 in all. And not just typical maps of land, but also of population, preferences, and other data. 

Interestingly, the maps of the past act similar to a time machine, allowing modern learners to understand the world as viewed in the past. 

Since debuting the video before the weekend, it has already garnered over 400,000 views! The video is also featured on Digg, YouTubeTrends, and NerdFighter