Interactive Time Geographic Data Visualization

I like this very simple example of how to visualize time based geographic data.  An example in the Tableau Public Gallery.  Click on it and play with the interaction.   " .... Graham Douglas of The Economist shows us how food availability measured in kilo-calories has changed since 1961. Use the slider to pick a decade and then hover over countries to see the food calories available per person. ... " .   I often browse the examples in the gallery.