This is amazing. I added Russia, China, Alice Springs and Hermannsburg into a table to see what sort of data I would get for population and area and infant mortality. The last 2 are from Australia and Hermannsburg is a small aboriginal community new Alice Springs. The biggest country is Russia - almost twice as large ad the US. The limitations are the data - where does the data come from and some data is only available for the larger cities. What happens if you find that the data provided is wrong?
if the data is not correct you can select new data via the web search. Im nearly sure there is a button too to click if the data IS useful. The data comes from the likes of Wikipedia