I found this when doing some research about data visualization (200 Countries, 200 Years, 4 Minutes). On a TED speech, Professor Hans Rosling tries to convince that we can get much more information in data than you think. You can see the population drop during World War and I also notice Cambodia had a population drop during the 1970s which lead to some historical lesson. Look like he found a way to visualization five dimension data.
This was the first time I implemented a thing with a solid background. I was trying to found out how much value we can mine from data visualization.