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Currently in 2018, the Earth is estimated to contain around 7.3 billion people on the planet, but it is beleave that in 2050 the Earth will consume of 9.7 billion people.

The largest country in the world ( Russia) has an estimated population of 145,964,709. 

However the smallest country (Vatican city) has an estimated population of only 840 inhabitants. 

So maby in the future, the scientific prediction of 9.7 billion people will actually come true?