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At the end of all this, Russia held in her hands a vast belt of land running from the Baltic sea in the north to the Black Sea in the south, comprising eleven nations with a population of 100 million people.

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Hermann von Helmholtz

A raised weight can produce work, but in doing so it must necessarily sink from its height, and, when it has fallen as deep as it can fall, its gravity remains as before, but it can no longer do work.