World Population Density

This is a prime example of how seeing the data visually is better than reading numbers. Here is a population density map from Wikipedia.

We have heard that China and India have most of the human population in the world, but here you can really see and understand how much. Reading that China's population is four times that of the U.S. is much harder than really seeing it on a map.

The Wikipedia page on World Population has some other great information too.