Click on one of the categories
to get started, or click the ? for help.
Click on this button to toggle
the help screen you are on now.
Click on categories to expand
the menu, and then click on the
sub-category to display on the map.
Click on the cities you would
like to see displayed on the map.
You can play and pause the
animation with this button
Use this slider bar when it
appears to see change over time.
Just click and drag the node to interact.