intro

https://www.youtube.com/watch?v=au5cUpUT2ig (you might learn something)

https://www.youtube.com/watch?v=nPgn4yNmLXI (dtrt)

http://www.youtube.com/watch?v=sMoKcsN8wM8 (bigbangbigboom)

http://lizardpoint.com/geography/world-quiz.php (worldmap)