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#february28

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February 28

This day in history:

  • 202 BC – Liu Bang is enthroned as the Emperor of China, beginning four centuries of rule by the Han dynasty.
  • 1958 – A school bus in Floyd County, Kentucky hits a wrecker truck and plunges down an embankment into the rain-swollen Levisa Fork river. The driver and 26 children die in one of the worst school bus accidents in U.S. history.
  • 2001 – The 2001 Nisqually earthquake, having a moment magnitude of 6.8, with epicenter in the southern Puget Sound, damages Seattle metropolitan area.
  • 1638 – The Scottish National Covenant is signed in Edinburgh.

Births:

  • 1939 – Daniel C. Tsui, Chinese-American physicist and academic, Nobel Prize laureate
  • 1987 – Akito, Japanese professional wrestler
  • 1985 – Diego, Brazilian footballer

Deaths:

  • 1882 – Adolf Zytogorski, Polish-British chess master and translator (b. c. 1811/1812)
  • 1932 – Guillaume Bigourdan, French astronomer and academic (b. 1851)
  • 628 – Khosrow II, Shah of Iran, Sasanian Empire (b. c. 570)

Holidays:

  • National Science Day (India)
  • Peace Memorial Day (Taiwan)
  • Kalevala Day, also known as the Finnish Culture Day (Finland)

Random Article of the day:

Primary field

In theoretical physics, a primary field, also called a primary operator, or simply a primary, is a local operator in a conformal field theory which is annihilated by the part of the conformal algebra consisting of the lowering generators. From the representation theory point of view, a primary is the lowest dimension operator in a given representation of the conformal algebra. All other operators in a representation are called descendants; they can be obtained by acting on the primary with the raising generators.

en.wikipedia.orgFebruary 28 - Wikipedia