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Contributions
• Sokolov-Ternov effect
• Hamilton's principal function
• Hamilton's characteristic function
• Experimental observation of Hawking radiation
• Particle number operator*
• Self-organization in biology*
• Aleksandr Chudakov
• Alexey Andreevich
• A. P. Balachandran
• Igor Ternov
• Mark Trodden
• Stanislav Mikheyev
• Alexei Smirnov*
• Shamil Asgarov
• Seifallah Randjbar-Daemi
• Habil Aliyev
• Ahmad Bakikhanov
• Aşık Khanlar
• Suleyman Valiyev
• Heino Finkelmann
• Tom Lubensky
• Lubna al-Hussein
• Sheylanli tribe
• Sheylanli
• Boyat
• Ashaghy Aylis
• Agbash
• International Liquid Crystal Society
• British Liquid Crystal Society
• International Centre for Theoretical Physics*
• ANS Group of Companies
• ANS TV
• ANS ChM
• Khudafarin Bridges
• Azerbaijan Time
• Yemen Türküsü
• Jujalarim
• Föppl–von Kármán equations
- * Didn't create but significantly contributed
Picture of the day
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The siege of Baghdad took place in early 1258 when a large army under Hulegu, a prince of the Mongol Empire, attacked Baghdad, the capital of the Abbasid Caliphate. Hulegu had been sent by his brother, the Mongol khan Möngke, to conquer Persia. When Baghdad's ruler, Caliph al-Musta'sim, failed to reinforce the Mongol army, an angered Hulegu decided to overthrow him. The Mongol army routed a sortie led by al-Musta'sim's dawatdar (a leading minister) and besieged the city. After Mongol siege engines breached Baghdad's walls within days, al-Musta'sim surrendered and was later executed. The Mongol army pillaged the city for a week. The number of deaths was inflated by epidemics of disease, but Hulegu estimated his soldiers killed 200,000. Although the siege is often seen as the end of the Islamic Golden Age, Baghdad prospered under Hulegu's Ilkhanate. This double-page illustration, taken from a 14th-century manuscript of Rashid al-Din Hamadani's Jami' al-tawarikh, depicts the attempted escape of the dawatdar down the river Tigris (centre right); the soldiers on the pontoons forced him back to Baghdad with the loss of three ships. The manuscript forms part of the Diez Albums, now in the collection of the Berlin State Library in Germany.
Illustration credit: unknown
Today's featured article
The flag of Hong Kong depicts a white stylised five-petal flower of the Hong Kong orchid tree (Bauhinia × blakeana) in the centre of a field of Chinese red, the same red as on the flag of China. The Hong Kong Basic Law prescribes the design, and it is only to be made according to regulation and in approved sizes. Regulations regarding its use are stated in the Regional Flag and Regional Emblem Ordinance; its desecration is unlawful and has been punished. The flag was unveiled on 4 April 1990 and approved on 10 August 1996. It was first officially hoisted on 1 July 1997, during the handover ceremony marking the transfer of Hong Kong from the United Kingdom back to China, and replaced a colonial flag adopted in 1959. The 1959 flag, and a variant known as the Black Bauhinia, have been displayed by protesters in Hong Kong, particularly during the 2019–2020 Hong Kong protests. Government supporters often displayed the Chinese and Hong Kong flags together. (Full article...)