20th century deaths
The purpose of visual design is to help the end users benefit from the information. A good graph gets someone who is not inclined to look at complicated data, to actually spend time on it and learn something worthwhile. Look at this visualization of the major causes of death in the 20th Century. Did you know that tobacco killed 15 times more people than illegal drugs? Or that people were more inclined to commit suicide than to kill other people? And that 20% of all deaths in the world were self inflicted, through war, murder, and ideology?