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English-speaking countries and the vicissitudes of their destinies

What is the pressure of the gas, liquid and solid

The greatest number: the candidates for the title

Russia - this is the greatest country in the world

The Olympic Games in ancient Greece - the most important sporting events of antiquity

How to make gunpowder?

Perpetuum Mobile and gratuitous energy

A short frenulum men

How old is humanity: the land are reluctant to part with their secrets

Steppe viper: Is it dangerous?

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