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Interesting talk given at NYC D3js meetup showing some methods to clean up and maintain understandable code

Two-column web-based git difftool

Comparea lets you compare the area of two geographic features (continents, countries, states). Because of the projection that Comparea uses, this comparison is valid (the size of the features is proportional to their area) and suffers from minimal distortion. This lets you see just how big Greenland or Alaska really is.

Natural Earth is a public domain map dataset available at 1:10m, 1:50m, and 1:110 million scales. Featuring tightly integrated vector and raster data, with Natural Earth you can make a variety of visually pleasing, well-crafted maps with cartography or GIS software.