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I don't know all the places this could be used, but the graph in this article contains a STUNNING amount of information. I think the math is obvious, but I envision some phenomenal social science lessons, technology insights, the evolution of science, the implied connections to the ability of societies to spread information, the differences in cost of the various innovations and why that matters .... Hope you find something cool.

Be sure to follow the 3 links in the 4th paragraph. These are interesting displays of information. I haven't looked carefully at all of the graphs or their accuracies/biases, but many of these do draw you in to what they're trying to communicate--the point of data charts after all. What a refreshing break from staid bar charts.