It looks like ’tis the season to post low hanging fruits like videos, links and other people’s cartoons. The popular nerd & geek cartoon XKCD has been slowly going downhill over the last year or so, but with the latest installment, creator Randall Munroe hits it out of the park once again. Have you ever looked at an undated world map and wondered when it’s from? Here’s the solution (click will bring you to a large version):

XKCD: Map Age Guide by  Randall Munroe (http://xkcd.com/1688/)