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An abacus (pl. abaci or abacuses), also called a counting frame, is a hand-operated calculating tool which was used from ancient times in the ancient Near East, Europe, China, and Russia, until the adoption of the Hindu–Arabic numeral system. [1] An abacus consists of a two-dimensional array of slidable beads (or similar objects). In their ...
However, the decimality of the Russian abacus (explained by Russian ruble's being the world's first decimal currency) and its simplicity (compared to the previous European and Asian versions) led to the wide use of this device in Russia well until the advent of electronic calculators in the late 20th century, though it remains in quite common ...
The Millennium of Russia monument in Veliky Novgorod (unveiled on 8 September 1862). The history of Russia begins with the histories of the East Slavs. [1] [2] The traditional start date of specifically Russian history is the establishment of the Rus' state in the north in the year 862, ruled by Varangians.
This is a timeline of Russian history, comprising important legal and territorial changes and political events in Russia and its predecessor states. To read about the background to these events, see History of Russia .
The counting board is the precursor of the abacus, [1] and the earliest known form of a counting device (excluding fingers and other very simple methods). Counting boards were made of stone or wood, and the counting was done on the board with beads, pebbles etc. [ 2 ] Not many boards survive because of the perishable materials used in their ...
Mikhail Lomonosov, Russian polymath scientist, inventor, poet and artist, the founder of Moscow State University. At the start of the 18th century the reforms of Peter the Great (founder of the Russian Academy of Sciences and Saint Petersburg State University) and the work of such champions as polymath Mikhail Lomonosov (the founder of Moscow State University) gave a great boost to the ...
A young girl using an abacus in a bed at the Columbia Presbyterian Medical Center in New York, circa 1950. Douglas Grundy/Three Lions/Getty Images Polio mainly affects children under the age of five.
The Imperial Russian apothecaries' weight was defined by setting the grain (Russian: гран) to be exactly seven-fifths of a dolya. The only unit name shared between the two was the funt (pound), but the one in the apothecaries' system is exactly seven-eighths of the ordinary funt.