Ever wondered where those electrons come from when you plug something into your wall? Well, the Wall Street Journal has a lovely map which shows the main sources of electricity in each of the U.S. states.

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In fact, it shows how it's changed since 2001 too—not that you'd notice much difference at a glance. Look closely, though, and more states use natural gas as their main fuel and fewer use coal, and now a full four states use hydroelectricity as their primary source. For a full breakdown, go read the Wall Street Journal post—it's fascinating. [WSJ]