Walmart takes over the US, one green dot at a time

My friend, Ms. L (a fellow data nut), sent along this wonderful link.  Similar to the power of the gapminder.com software, this dynamic picture maps the US-based growth of Walmart since 1962.   The rapid multiplication of green dots makes it look like a disease spreading across the US… inspires quite a visceral reaction in the viewer.

http://projects.flowingdata.com/walmart/