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  2. European Union - Wikipedia

    en.wikipedia.org/wiki/European_Union

    The European Union ( EU) is a supranational political and economic union of 27 member states that are located primarily in Europe. [8] [9] The Union has a total area of 4,233,255 km 2 (1,634,469 sq mi) and an estimated total population of over 448 million. The EU has often been described as a sui generis political entity (without precedent or ...

  3. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    t. e. The number π ( / paɪ /; spelled out as " pi ") is a mathematical constant that is the ratio of a circle 's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics.

  4. Cold War - Wikipedia

    en.wikipedia.org/wiki/Cold_War

    The Cold War was a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc, that started in 1947, two years after the end of World War II and lasted to 1991, the fall of the Soviet Union. The term cold war is used because there was no large-scale fighting ...

  5. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_code

    The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; the pattern of position detection was found and determined by applying the least-used ratio (1:1:3:1:1) in black ...

  6. Valentine's Day - Wikipedia

    en.wikipedia.org/wiki/Valentine's_Day

    Valentine's Day, also called Saint Valentine's Day or the Feast of Saint Valentine, [1] is celebrated annually on February 14. [2] It originated as a Christian feast day honoring a martyr named Valentine, and through later folk traditions it has also become a significant cultural, religious and commercial celebration of romance and love in many ...

  7. Atomic bombings of Hiroshima and Nagasaki - Wikipedia

    en.wikipedia.org/wiki/Atomic_bombings_of...

    On 6 and 9 August 1945, the United States detonated two atomic bombs over the Japanese cities of Hiroshima and Nagasaki. The bombings killed between 129,000 and 226,000 people, most of whom were civilians, and remain the only use of nuclear weapons in an armed conflict. Japan surrendered to the Allies on 15 August, six days after the bombing of ...

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