I don't understand how it works. First time clicking on Poland, it showed a kind of a heat map around some city. Then I click on another location and nothing happens. OK, there's a "back" button, I go back, click on the map again in a different place and... nothing happens. No heat map. At some point in frustration I accidentally move the mouse while clicking and the map rotates upside down. Don't know, is it me, my browser, or there's something about the UI.