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  2. BBC Learning English - Wikipedia

    en.wikipedia.org/wiki/BBC_Learning_English

    BBC Learning English. BBC Learning English is a department of the BBC World Service devoted to English language teaching. The service provides free resources and activities for teachers and students, primarily through its website. It also produces radio programmes which air on some of the BBC World Service's language services and partner stations.

  3. Amazon (company) - Wikipedia

    en.wikipedia.org/wiki/Amazon_(company)

    Amazon was founded on July 5, 1994, by Jeff Bezos in Bellevue, Washington. [6] The company originally started as an online marketplace for books but gradually expanded its offerings to include a wide range of product categories. This diversification led to it being referred to as "The Everything Store". [7]

  4. English language - Wikipedia

    en.wikipedia.org/wiki/English_language

    English is a West Germanic language in the Indo-European language family, whose speakers, called Anglophones, originated in early medieval England. [4] [5] [6] The namesake of the language is the Angles, one of the ancient Germanic peoples that migrated to the island of Great Britain.

  5. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers, commonly denoted Fn . The sequence commonly starts from 0 and 1, although some authors start the sequence from 1 and 1 or sometimes (as did Fibonacci ...

  6. Chalkboard scraping - Wikipedia

    en.wikipedia.org/wiki/Chalkboard_scraping

    Chalkboard scraping. Scraping a chalkboard (also known as a blackboard) with one's fingernails produces a sound and feeling which most people find extremely irritating. The basis of the innate reaction to the sound has been studied in the field of psychoacoustics (the branch of psychology concerned with the perception of sound and its ...

  7. Russia - Wikipedia

    en.wikipedia.org/wiki/Russia

    RU. Internet TLD. .ru. .рф. Russia, [b] or the Russian Federation, [c] is a country spanning Eastern Europe and North Asia. It is the largest country in the world by area, extending across eleven time zones and sharing land borders with fourteen countries. [d] It is the world's ninth-most populous country and Europe's most populous country.

  8. Blackboard - Wikipedia

    en.wikipedia.org/wiki/Blackboard

    Uses. Reusable writing surface on which text or drawings are made. A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.

  9. Blackboard system - Wikipedia

    en.wikipedia.org/wiki/Blackboard_system

    A blackboard system is the central space in a multi-agent system. It's used for describing the world as a communication platform for agents. To realize a blackboard in a computer program, a machine readable notation is needed in which facts can be stored. One attempt in doing so is a SQL database, another option is the Learnable Task Modeling ...

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