All articles starting with F
15,892 articles
Flandres Bay
Flandres Bay (Baie des Flandres), a glacial bay between Cape Renard and Cape Willems on the Danco Coast, Antarctic Peninsula; charted by the Belgian Antarctic Expedition in February 1898, 16 km deep, poorly charted, marine-only tourist site.
Flâneur
Flâneur: the idly strolling urban observer of nineteenth-century Paris, from the French flâner; first described in an 1806 pamphlet, defined by Baudelaire in 1863, theorized by Walter Benjamin, with the female counterpart flâneuse.
Flange
A flange is a protruding rim or lip on a component that provides a mating surface for connection, as in bolted, gasketed pipe joints and the load-carrying plates of I-beams.
Flange focal distance
Flange focal distance, also called flange-to-film distance or registration distance, is the distance along the optical axis from a lens mount's flange to the film or sensor plane.
Flanging
Flanging is an audio effect produced by mixing a signal with a continuously varied delayed copy of itself, creating a sweeping comb filter heard as a jet-like whoosh.
Flanker task
The flanker task is a cognitive psychology paradigm in which a participant responds to a central target while ignoring flanking items, measuring attentional selectivity and inhibition.
Flann O'Brien
Flann O'Brien was the best-known pen name of Irish novelist Brian O'Nolan (1911 to 1966), now ranked with Joyce and Beckett as a leading figure of Irish modernism.
Flannan Isles Lighthouse
Flannan Isles Lighthouse, also known as Eilean Mor Lighthouse, stands on Eilean Mòr, 21 miles west of Lewis, Scotland, and was first lit on 7 December 1899.
Flannel
Flannel, also called brushed cotton, is a soft woven fabric from wool, cotton, or synthetic fibers, finished by napping to raise a warm fuzzy surface; it originated in Wales.
Flannery O'Connor
Flannery O'Connor (1925–1964), American Southern Gothic writer from Georgia; author of Wise Blood, The Violent Bear It Away and A Good Man Is Hard to Find; devout Catholic, died of lupus at 39; 32 short stories; posthumous 1972 National Book Award.
Flanona
Flanona (Greek Φλάνων), ancient Roman town at modern Plomin, Istria, Croatia; municipium with ius Italicum on the Sinus Flanaticus (Kvarner Gulf), later eclipsed by Albona.
Flans
Flans is a Mexican female pop trio formed in 1985 within Televisa, originally Ilse, Mimí, and Ivonne, known for the hits "Bazar" and "No controles".
Flap (aeronautics)
A flap, also called a wing flap, is a movable trailing-edge device on an aircraft wing that increases lift by changing camber, allowing slower, safer takeoffs and landings.
Flap endonuclease 1
Flap endonuclease 1 (FEN1, RAD2/MF1/FEN-1) is a structure-specific 5′ nuclease conserved from archaea to humans that removes 5′ DNA flaps during Okazaki fragment maturation and long-patch base excision repair, uses a double-flap substrate and helical-arch threading, and is a cancer biomarker and drug target.
Flap monitoring
Flap monitoring is the postoperative assessment of a transferred tissue flap's perfusion and viability, by bedside exam or devices, to catch vascular compromise early enough for salvage surgery.
Flapjack (oat bar)
Flapjack (oat bar), also called oat bar, cereal bar, or oat slice, is a British baked bar of rolled oats, butter, brown sugar, and golden syrup, set by cooling syrup, distinct from the North American pancake sense of flapjack.
Flapper
Flapper: young women of the 1920s in America and Britain, also called the New Woman or garconne, defined by bobbed hair, short beaded dresses, jazz-age freedom, and the 1929 crash that ended the era.
Flapper-nozzle valve
A flapper-nozzle valve is a hydraulic or pneumatic pilot stage whose movable flapper varies nozzle restrictions, creating the pressure differential that positions the spool of an electrohydraulic servo valve.
Flapping Airplanes, Inc.
Flapping Airplanes, Inc. is a San Francisco-based AI research lab founded in 2025 by Ben Spector, Asher Spector, and Aidan Smith. It raised $180 million in seed funding.
Flapping foil propulsion
Flapping foil propulsion generates thrust in a fluid by oscillating a wing-like foil in combined heaving and pitching motion, mimicking swimming animals such as tunas and sea turtles.
Flappy Bird
Flappy Bird: 2013 free one-tap mobile game by Vietnamese developer Dong Nguyen (.GEARS Studios); 50M+ downloads, $50k/day ad peak, removed February 2014 over addiction concerns, trademark canceled 2024, disputed 2024 crypto-linked revival.
Flappy Bird (2024 video game)
Flappy Bird (2024 video game), the Flappy Bird Foundation revival of Dong Nguyen's 2013 mobile hit, announced September 2024 via a trademark chain through Gametech Holdings; Nguyen disavowed it, and early crypto and Solana ties drew controversy.
Flare
A flare, also called a signal or road flare, is a pyrotechnic device burning a fuel-oxidizer mixture for intense light, used for signaling, illumination, and military decoys.
Flare (countermeasure)
A flare, also known as a decoy flare, is an expendable pyrotechnic device ejected from aircraft, ships, or ground vehicles to decoy infrared-guided missiles, used since 1959.
Flare emission modeling in blazars and gamma-ray bursts
Flare emission modeling quantitatively describes sudden radiation increases from relativistic jets in blazars and gamma-ray bursts, testing whether electrons or protons produce the observed gamma rays.
Flare gun
A flare gun, also called a signal pistol or Very pistol, is a handgun-shaped launcher that fires pyrotechnic flares, most often for maritime distress signaling.
Flare star
A flare star, or UV Ceti star, is a variable star, typically a red dwarf, that shows sudden, short-lived increases in brightness powered by magnetic energy.
Flare Therapeutics
Flare Therapeutics is a Cambridge, Massachusetts clinical-stage biotechnology company founded in 2021 that develops small-molecule drugs targeting transcription factors for cancer, with over $290 million raised and lead candidate FX-909.
Flash
Flash was a multimedia software platform that delivered animations, games, and video content to web browsers. At its peak, it was the dominant content delivery mechanism on the internet.
Flash (Jay Garrick)
Flash (Jay Garrick) is DC Comics' original Flash, debuting in Flash Comics #1 (1940) by Gardner Fox and Harry Lampert. Distinguished from Barry Allen and Wally West by his Mercury winged helmet, Keystone City base, Earth-2 Justice Society origins, and hard-water lab accident origin.