All articles starting with B
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Bir Tawil
Bir Tawil (بير طويل), about 800 sq mi of desert between Egypt and Sudan, is claimed by neither country because the 1899 and 1902 boundary lines that would grant it would cost each state the Hala'ib Triangle.
Bir, Himachal Pradesh
Bir, Himachal Pradesh (Bir Billing), a village in Kangra district's Joginder Nagar Valley, India's paragliding capital: Billing takeoff near 2,400 m, Bir landing, 2015 World Cup host, Tibetan settlement with monasteries.
Bira 91
Bira 91 is an Indian craft beer brand launched February 2015 by Ankur Jain under B9 Beverages (91 = India's ISD code). It reached the #2 beer brand rank behind Kingfisher, then suffered a financial crisis leading to Kirin's exit and Jain's 2026 departure.
Bira91
Bira91 is an Indian craft beer brand owned by B9 Beverages, founded by Ankur Jain in New Delhi in 2015, which raised over $200 million before halting production in 2025.
Biradiolites
Biradiolites d'Orbigny 1850 is an extinct radiolitid rudist bivalve genus, Turonian to late Maastrichtian, cosmopolitan in Tethyan seas, defined by furrowed radial bands, no ligamental ridge, and species used as Maastrichtian index fossils.
Birago Diop
Birago Diop (1906–1992) was a Senegalese veterinarian, diplomat, and writer who transcribed Wolof oral tales in French in Les Contes d'Amadou Koumba (1947), a central work of Negritude literature.
Biraj Bhatta
Biraj Bhatta (विराज भट्), born Bhojraj Bhatta, also called Viraj Bhatt or Tiger Biraj, is a Nepali action actor, director, and producer from Dhangadhi with 200+ films in Nepali, Bhojpuri, and Tharu cinema; his 2024 film 12 Gaun set a Nepali action box office record.
Birangana
Birangana (বীরাঙ্গনা) is a Bengali hoichoi crime thriller web series directed by Nirjhar Mitra, starring Sandipta Sen as Inspector Chitra Basu hunting serial killers; season 1 premiered 25 July 2025, season 2 on 15 October 2026, distinct from the Bangladeshi Birangona honorific.
Birational geometry
Birational geometry, also known as birational algebraic geometry, is the branch of algebraic geometry that studies varieties up to birational equivalence, meaning rational maps invertible on dense open subsets.
Biratnagar
Biratnagar (विराटनगर), capital of Koshi Province and a metropolitan city in Morang district, southeastern Nepal; Nepal's industrial capital since the 1936 Biratnagar Jute Mill, with 243,927 residents (2021) and the Jogbani border crossing.
Birbal (बीरबल)
Birbal (बीरबल), born Maheshdas c. 1528, was a Brahman courtier, poet (Kavi Ray 1573), and 2,000-strong mansabdar in Akbar's court, one of the Navratnas; he died February 1586 in the Yusufzai ambush at the Malandari Pass with 8,000 men. The famous Akbar-Birbal jokes are largely fictional, first printed in 1888.
Birbhaṇ
Birbhaṇ (बीरभान) is the figure one tradition credits with founding the Sadh, or Satnami Sadh, sect at Narnaul, Haryana, most accounts dating this to 1657.
Birbhum
Birbhum (বীরভূম) is the northernmost district of West Bengal's Burdwan Division, headquarters Suri, area 4,545 sq km, population 3.5 million (2011), defined by lateritic uplands, the Ajay and Mayurakshi rivers, and Rarh history.
BIRC2
BIRC2 (cIAP1, HIAP2, MIHB, API1) is a human protein-coding gene at 11q22.2 encoding a 618-amino-acid E3 ubiquitin ligase that regulates apoptosis, TNF and NF-κB signaling, and innate immunity, and is altered in several cancers.
BIRC3
BIRC3 (c-IAP2, HIAP1, API2) is a human IAP-family gene encoding an E3 ubiquitin ligase regulating apoptosis and NF-κB; its mutations mark aggressive CLL and FCR resistance, and BIRC3-MALT1 drives MALT lymphoma.
Birce Akalay
Birce Akalay (born 1984, Istanbul) is a Turkish actress, Miss Turkey 2004 third-place finisher, and former sports presenter. Known for Havva in Yer Gök Aşk, Lale Kıran in Netflix's Kuş Uçuşu, and Önem in Mezarlık.
Birch
Birch (Betula L.) is a genus of about 60 to 66 deciduous trees and shrubs in Betulaceae, native to the temperate Northern Hemisphere, with peeling bark, monoecious catkins, winged wind-dispersed seeds, and major timber species such as silver, downy, paper, and river birch.
Birch and Swinnerton-Dyer conjecture
The Birch and Swinnerton-Dyer conjecture, a Clay Millennium Prize Problem in number theory, states that an elliptic curve's L-function vanishes at s = 1 to order equal to its rank of rational points.
Birch Bayh
Birch Bayh (Birch Evans Bayh Jr., 1928-2019), Democratic U.S. senator from Indiana 1963-1981, author of the 25th and 26th Amendments, Title IX, and the Bayh-Dole Act; defeated by Dan Quayle in 1980.
Birch beer
Birch beer, also called white birch beer, is a non-alcoholic carbonated soda flavored with birch sap, bark, or oil, chiefly methyl salicylate; a Pennsylvania and Northeast regional wintergreen-flavored cousin of root beer.
Birch Hill Equity Partners
Birch Hill Equity Partners is a Toronto-based Canadian mid-market private equity firm making control investments of $75 million to $3 billion, with over $6 billion under management.
Birch Mountains
Birch Mountains: isolated forested plateau upland in northern Alberta, Canada, west of the Athabasca River; rises about 400-600 m above boreal plains to roughly 800 m, an Upper Cretaceous erosional remnant with a wildland provincial park and kimberlite field.
Birch pollen allergen skin prick test solution
白桦花粉变应原皮肤点刺液 (Skin Prick Solution for Betula platyphylla Suk. Pollen Allergens), NMPA-approved May 2023 (国药准字S20230023) by Zhejiang Wolwo Bio-Pharmaceutical; 50000 DU/ml birch pollen extract for skin prick diagnosis of type I birch pollen allergy.
Birch reduction
The Birch reduction, also called the Birch reaction, is an organic reaction that partially reduces aromatic rings to 1,4-cyclohexadienes using lithium or sodium in liquid ammonia.
Birch–Murnaghan equation of state
The Birch–Murnaghan equation of state is an isothermal pressure–volume relation for solids, derived by Francis Birch in 1947 from finite strain theory to fit compression data.
Birchbark canoe
A birchbark canoe is a light watercraft of birch bark sewn over a cedar frame, developed by Indigenous peoples of North America and adopted by fur traders.
Birching
Birching, corporal punishment with a birch rod or bundle of birch twigs, used in British civil courts, Royal Navy discipline, schools, and the Isle of Man until its 1978 condemnation by the European Court of Human Rights and final abolition.
Bird
Birds: endothermic, feathered vertebrates and living theropod dinosaurs, with powered flight, air-filled bones, and unidirectional lung ventilation; over 11,000 species, 61% declining, 1 in 8 threatened with extinction.
Bird (1988 film)
Bird (1988) is Clint Eastwood's biographical drama of jazz saxophonist Charlie "Yardbird" Parker, starring Forest Whitaker and Diane Venora, written by Joel Oliansky, premiered at Cannes 1988, and winner of the Academy Award for Best Sound.
Bird anatomy
Bird anatomy: structure of birds (Aves), feathered theropod dinosaurs. Rigid lungs ventilated by 7-9 air sacs with unidirectional parabronchial airflow, keeled sternum, furcula, pygostyle, crop, and gizzard.