Very cool. A similar site posted last week [0] also allows you to drag and drop specific countries across the map for direct comparisons (Mercator projection only).
Wow, I would not have thought Russia and China to be comparable in size. Yes, Russia is still bigger than China, but nowhere near as giant as the map makes it appear.
Make sure you drag Russia to China rather than the other way around. Otherwise the differences get exaggerated.
> Whenever we try to represent our 3D earth on a 2D map we necessarily introduce distoration. This tool attempts to visualize the phenomenon.