Some concepts are easier to understand when you see a graph. With HTML5, a lot of data and a bit of time, you can build a system that can visualize things like “live span over number of children” or the sources of energy over time. Interesting that nuclear power, renewable energy and energy from crude oil is about the same level today.
This view seems to indicate that the GDP of a country starts to kick off as soon as each family has two or fewer children. But maybe it just shows that after financial constructs like derivatives and bonds allow to accumulate enormous wealth in a short time. “Correlation does not imply causation“
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