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  1. The Chernobyl disaster [a] began on 26 April 1986 with the explosion of the No. 4 reactor of the Chernobyl Nuclear Power Plant, near the city of Pripyat in the north of the Ukrainian SSR, close to the border with the Byelorussian SSR, in the Soviet Union. [1] It is one of only two nuclear energy accidents rated at seven—the maximum severity ...

    • Reactor design and operator error
    • INES Level 7 (major accident)
    • 26 April 1986; 37 years ago
  2. The Three Mile Island accident was a nuclear meltdown of the Unit 2 reactor (TMI-2) of the Three Mile Island Nuclear Generating Station on the Susquehanna River in Londonderry Township, near Harrisburg, the capital city of Pennsylvania, United States. The reactor accident began at 4:00 a.m. on March 28, 1979, and released radioactive gases and ...

    • INES Level 5 (accident with wider consequences)
  3. Battle of the Bulge Part of the Western Front of World War IIAmerican soldiers of the 117th Infantry Regiment, Tennessee National Guard, part of the 30th Infantry Division, move past a destroyed American M5A1 "Stuart" tank on their march to recapture the town of St. Vith during the Battle of the Bulge, January 1945.

  4. en.wikipedia.org › wiki › WikipediaWikipedia - Wikipedia

    Wikipedia[note 3] is a free content online encyclopedia written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and the use of the wiki-based editing system MediaWiki. Wikipedia is the largest and most-read reference work in history.[3][4] It is consistently ranked as one of the ten most popular ...

  5. en.wikipedia.org › wiki › 11 - Wikipedia

    • As A Word
    • Symbols and Representation
    • In Mathematics
    • In Technology
    • In Science
    • In Philosophy
    • See Also

    Etymology

    One originates from the Old English word an, derived from the Germanic root *ainaz, from the Proto-Indo-European root *oi-no-(meaning "one, unique").

    Modern usage

    Linguistically, one is a cardinal number used for counting and expressing the number of items in a collection of things. One is commonly used as a determiner for singular countable nouns, as in one day at a time. One is also a gender-neutral pronoun used to refer to an unspecified person or to people in general as in one should take care of oneself. Words that derive their meaning from one include alone, which signifies all one in the sense of being by oneself, none meaning not one, once deno...

    Among the earliest known record of a numeral system, is the Sumerian decimal-sexagesimal system on clay tablets dating from the first half of the third millennium BCE. The Archaic Sumerian numerals for 1 and 60 both consisted of horizontal semi-circular symbols. By c.2350 BCE, the older Sumerian curviform numerals were replaced with cuneiform symbo...

    Mathematically, the number 1 has unique properties and significance. In normal arithmetic (algebra), the number 1 is the first natural number after 0 (zero) and can be used to make up all other integers (e.g., 1 = 1 {\displaystyle 1=1} ; 2 = 1 + 1 {\displaystyle 2=1+1} ; 3 = 1 + 1 + 1 {\displaystyle 3=1+1+1} etc.).The product of 0 numbers (the empt...

    In digital technology, data is represented by binary code, i.e., a base-2 numeral system with numbers represented by a sequence of 1s and 0s. Digitised data is represented in physical devices, such as computers, as pulses of electricity through switching devices such as transistors or logic gates where "1" represents the value for "on". As such, th...

    Hydrogen, the first element of the periodic table, has an atomic numberof 1.
    Group 1 of the periodic table consists of the alkali metals.
    Period 1 of the periodic table consists of just two elements, hydrogen and helium.

    In the philosophy of Plotinus (and that of other neoplatonists), The One is the ultimate reality and source of all existence. Philo of Alexandria(20 BC – AD 50) regarded the number one as God's number, and the basis for all numbers ("De Allegoriis Legum", ii.12 [i.66]). The Neopythagorean philosopher Nicomachus of Gerasa affirmed that one is not a ...

  6. Background Titanic on sea trials, 2 April 1912 At the time of her entry into service on 2 April 1912, the Titanic was the second of three Olympic-class ocean liners, and was the largest ship in the world.She and the earlier RMS Olympic were almost one and a half times the gross register tonnage of Cunard's RMS Lusitania and RMS Mauretania, the previous record holders, and were nearly 100 feet ...

  7. 4. Japan Air Lines Flight 123 was a scheduled domestic passenger flight from Tokyo to Osaka, Japan. On August 12, 1985, the Boeing 747 flying the route suffered a severe structural failure and decompression 12 minutes into the flight. After flying under minimal control for a further 32 minutes, the 747 crashed in the area of Mount Takamagahara ...

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