Figuring out the global economy has always involved looking at the data. But only in recent years has big data, such as that contained in satellite imagery, become a factor in helping understand what's going on. One place where it's particularly useful is China, where official figures are far less comprehensive than in the U.S. and most other developed nations. It's also provided badly-needed insight into poverty across Africa. Scott and Dan get the scoop from UC-Berkeley professor Joshua Blumenstock and Bloomberg China economy editor Jeff Kearns.