Answer the question at the end by quoting:

Uriah Heep are an English heavy metal band formed in London in 1969. It has had the same lineup since 2013: lead and rhythm guitarist Mick Box, keyboardist Phil Lanzon, lead vocalist Bernie Shaw, drummer Russell Gilbrook and bassist Davey Rimmer. Of the current lineup, Box is the only remaining original member.
The lineup remained unchanged from 1986 until 2007, being veteran Mick Box at the helm, Trevor Bolder on bass, Lee Kerslake on drums, vocalist Bernie Shaw and Phil Lanzon on keyboards. Their principal tour circuit has been in Germany, the Netherlands, Scandinavia, Japan and Russia. In December 1987 they were one of the first ever Western bands to play in Soviet Russia (UB40 were the first in 1986), under Mikhail Gorbachev's policy of glasnost (Nitty Gritty Dirt Band and Elton John had already played shows there in the late 70s during the pre-Gorbachev era). At Moscow's Olympic Stadium the band played ten consecutive nights to a total of 180,000 people (following a reception that Bernie Shaw remembered as being "something like Beatlemania"), which was represented in the international press as not just an achievement for Uriah Heep but a major breakthrough for Western music in general. The concerts were recorded and issued as the Live in Moscow album, which included three new tracks. Ironically, it was this behind the Iron Curtain excursion that did well to re-establish Heep's name back at home. After a series of sell-out dates in Czechoslovakia, East Berlin and Bulgaria the band returned to Britain for the Reading Festival in August 1988, and toured the UK with The Dogs D'Amour. Raging Silence, produced by Richard Dodd and released in May 1989, was followed by a return to the Soviet Union, concerts in Poland, East Berlin, six dates in Brazil and another British tour. "The last two years have been the most enjoyable of all my time in Heep," Trevor Bolder was quoted to say at the time. The band played in the Central TV studios in Nottingham on 29 November 1989 (the film was shown as part of the Independent TV series Bedrock and a few years later it was repeated in the Cue Music series) and celebrated its 20th Anniversary with a series of compilations and re-issues. Produced by Trevor Bolder and released early in 1991, Different World got a mixed reception from the press (put down in Kerrang!, hailed in Metal Hammer) and sold poorly. "Yet another technically sound but artistically bland recording from Uriah Heep" (according to AllMusic) failed to chart and marked the end of the band's contract with Legacy Records. Touring incessantly, the band issued some compilations of which Rarities from the Bronze Age and The Lansdowne Tapes (featuring previously unreleased material from the early 1970s) are considered most noteworthy. Still the first half of the 1990s is regarded even by the Heep fans as "the wilderness years."

what is the most important fact stated in the article?

In December 1987 they were one of the first ever Western bands to play in Soviet Russia (UB40 were the first in 1986), under Mikhail Gorbachev's policy of glasnost (

Answer the question at the end by quoting:

Claude Elwood Shannon (April 30, 1916 - February 24, 2001) was an American mathematician, electrical engineer, and cryptographer known as "the father of information theory". Shannon is noted for having founded information theory with a landmark paper, A Mathematical Theory of Communication, that he published in 1948. He is, perhaps, equally well known for founding digital circuit design theory in 1937, when--as a 21-year-old master's degree student at the Massachusetts Institute of Technology (MIT)--he wrote his thesis demonstrating that electrical applications of Boolean algebra could construct any logical, numerical relationship. Shannon contributed to the field of cryptanalysis for national defense during World War II, including his fundamental work on codebreaking and secure telecommunications.
In 1948, the promised memorandum appeared as "A Mathematical Theory of Communication," an article in two parts in the July and October issues of the Bell System Technical Journal. This work focuses on the problem of how best to encode the information a sender wants to transmit. In this fundamental work, he used tools in probability theory, developed by Norbert Wiener, which were in their nascent stages of being applied to communication theory at that time. Shannon developed information entropy as a measure of the uncertainty in a message while essentially inventing the field of information theory. The book, co-authored with Warren Weaver, The Mathematical Theory of Communication, reprints Shannon's 1948 article and Weaver's popularization of it, which is accessible to the non-specialist. Warren Weaver pointed out that the word information in communication theory is not related to what you do say, but to what you could say. That is, information is a measure of one's freedom of choice when one selects a message. Shannon's concepts were also popularized, subject to his own proofreading, in John Robinson Pierce's Symbols, Signals, and Noise. Information theory's fundamental contribution to natural language processing and computational linguistics was further established in 1951, in his article "Prediction and Entropy of Printed English", showing upper and lower bounds of entropy on the statistics of English - giving a statistical foundation to language analysis. In addition, he proved that treating whitespace as the 27th letter of the alphabet actually lowers uncertainty in written language, providing a clear quantifiable link between cultural practice and probabilistic cognition. Another notable paper published in 1949 is "Communication Theory of Secrecy Systems", a declassified version of his wartime work on the mathematical theory of cryptography, in which he proved that all theoretically unbreakable ciphers must have the same requirements as the one-time pad. He is also credited with the introduction of sampling theory, which is concerned with representing a continuous-time signal from a (uniform) discrete set of samples. This theory was essential in enabling telecommunications to move from analog to digital transmissions systems in the 1960s and later. He returned to MIT to hold an endowed chair in 1956.

how was it implemented?
he used tools in probability theory, developed by Norbert Wiener, which were in their nascent stages of being applied to communication theory at that time.