I came across this interactive world population density map over the weekend and I immediately thought to myself, "this is going on the blog." It uses data from the Global Human Settlement Layer (GHSL) produced by the European Commission and by CIESIN (super long name) at Columbia University. And it's a fascinating way to explore how our world is urbanizing.

What you will want to do is make sure that you head over to China and check out regions like the Yangtze River Delta (shown above). If you hover over a location, it will also bring up a graph and table showing you how that place has evolved from 1975 to 2015. Note: Shanghai's peak population density in 2015 was 104,400 people per square kilometer!