30 December - Saturday
1922 The Union of Soviet Socialist Republics (USSR) is formed! The former is the largest state in the world in terms of area, the second by economic and military power and the third by population. The USSR occupied the eastern half of Europe and the northern third of Asia.
Day of remembrance of the prophet Daniel and the holy three children of Ananias, Azariah and Misael.
1927 Russian chemist Sergei Lebedev was the first in the world to develop a method for producing synthetic rubber.