1924 introductions

theorem that there exists a decomposition of a unit solid ball into a finite number of disjoint subsets, which can be put back together in a different way to yield two identical copies of the unit sphere

political concept similar to the hypothesised United States of Europe

geographical area where a group of organisms develop particular properties

The New Turkic Alphabet, known in Turkic languages as Yañalif (Tatar: / , / ; ), is the first Latin alphabet used during the Latinisation in the Soviet Union in the 1930s for the Turkic languages. It replaced the Arabic script-based alphabets like Yaña imlâ used for Tatar in 1928, and was replaced by the Cyrillic alphabet in 1938–1940. After their respective independence in 1991, several former Soviet states in Central Asia switched back to Latin script, with slight modifications to the original Yañalif.

hypothetical common ancestor of Greek and Armenian languages

thumb|Masonite board thumb|Back side of a masonite board thumb|Isorel, thumb|Quartrboard, Masonite Corporation,

topological embedding of a 2-dimensional sphere in 3-space whose interior is a 3-ball but whose exterior is not simply connected

fictional forest

Emission of secondary X-rays from a material excited by high-energy X-rays

__NOTOC__ thumb|150px|upright| In philately, Leniniana is a topic for collecting postage stamps that tell about the life and story of Vladimir Lenin (1870–1924) or people, places, etc. connected with him. The topic was common in the Soviet Union.

writing system used by a religious rebellion in Laos