All articles starting with F
15,892 articles
False Flag (כפולים) (TV series)
False Flag (כפולים, Kfulim) is an Israeli suspense drama created by Maria Feldman and Amit Cohen, first aired 29 October 2015 on Keshet/Channel 2. Three anthology seasons follow ordinary Israelis whose passports surface in Mossad-attributed incidents; sold to Fox International and Canal+, remade as Apple TV+'s Suspicion.
False friend
False friend (French faux ami): a word in one language resembling a word in another but differing in meaning, e.g., English gift versus German Gift 'poison'. Term coined by Koessler and Derocquigny in 1928; covers chance and semantic false friends, total and partial types.
False gharial
False gharial (Tomistoma schlegelii), also Sunda gavial or Malayan gharial: an endangered long-snouted freshwater crocodilian of Indonesia, Malaysia, and Brunei, historically placed in Crocodylidae but molecularly allied with the true gharial Gavialis.
False imprisonment
False imprisonment, also known as unlawful detention or wrongful confinement, is the intentional confinement of a person without consent or legal authority, recognized as both a crime and a tort.
False killer whale
False killer whale (Pseudorca crassidens), a large dark dolphin of tropical and subtropical oceans; only the main Hawaiian Islands insular population, about 139 whales, is endangered.
False memory
False memory: remembering events that never happened or happened differently. Studied via the DRM word-list paradigm (Deese 1959; Roediger & McDermott 1995), misinformation and implantation paradigms; gist-based, persistent, and indistinguishable from true memory by confidence or brain measures.
False memory syndrome
False memory syndrome (FMS) is a term coined in 1992 by the False Memory Syndrome Foundation for strongly believed false trauma memories; it is not an accepted diagnosis and was critically characterized as pseudoscientific.
False Negative Reactions
False Negative Reactions: MeSH term (D005188) for negative test results in people who have the tested condition; false negative rate = 1 − sensitivity, ranging from 1.5% (myocardial infarction) to 56% (spinal abscess) in ED studies.
False or misleading statements by Donald Trump (between terms)
False or misleading statements by Donald Trump between his presidencies (January 2021 to January 2025): PolitiFact's 1,000 fact-checks, 76% false ratings, repeated 2020 election fraud claims, and 2024 campaign falsehoods.
False or misleading statements by Donald Trump (first term)
False or misleading statements by Donald Trump's first term (2017-2021), tracked by the Washington Post Fact Checker at 30,573 total, about 21 per day, rising from 6 to 39 daily claims by year; election fraud claims rejected by 62 lawsuits and courts.
False or misleading statements by Donald Trump (second term)
False or misleading statements by Donald Trump (second term): public claims by Trump since January 2025 rated false by fact-checkers, covering inflation, jobs, immigration, and 2020 election claims, tracked by PolitiFact, FactCheck.org, AP, and the Washington Post.
False Positive (film)
False Positive (2021) is an A24 psychological horror film directed by John Lee, co-written with star Ilana Glazer, about a couple's sinister fertility doctor, released on Hulu after a Tribeca premiere.
False positive rate
The false positive rate (FPR) is the proportion of condition-free subjects that a test or classifier wrongly flags as positive, equal to 1 − specificity.
False Positive Reactions
False Positive Reactions: MeSH descriptor D005189 for positive test results in people lacking the tested attribute, i.e., healthy people labeled diseased; rate equals 1 minus specificity, driven by low prevalence and low pretest probability.
False positives and false negatives
A false positive is a test result that incorrectly indicates a condition is present, and a false negative one that incorrectly indicates it is absent, measured by sensitivity and specificity.
False pregnancy
False pregnancy (pseudocyesis, phantom pregnancy) is a rare psychosomatic syndrome in which a nonpregnant person believes they are pregnant and shows real pregnancy signs, with negative hCG tests and ultrasound, treated with imaging confirmation plus psychological care.
False prophet
A false prophet, or false prophecy, is a person accused within a religious tradition of claiming divine revelation without divine authorization; Deuteronomy prescribes death, and Islam holds prophethood closed.
False sharing
False sharing is a performance pathology in shared-memory parallel systems where processors use different variables that sit in the same cache line, causing needless coherence traffic.
False titles of nobility
False titles of nobility, sometimes called royal title scams, are invented or assumed titles of rank that no country's authorities recognize, often sold with tiny souvenir plots of Scottish land.
False vacuum decay
False vacuum decay, also called vacuum decay, is the quantum tunneling of a metastable vacuum to a lower-energy true vacuum, with a theory developed by Sidney Coleman in 1977.
False-positive serological test for syphilis
False-positive serological test for syphilis (biologic false positive, BFP; ICD-11 MA14.16): a reactive nontreponemal test such as RPR or VDRL caused by conditions other than syphilis, including autoimmune disease, HIV, malaria, pregnancy, and vaccination; occurs in roughly 0.2%–0.8% of the population and is resolved by confirmatory treponemal testing.
Falsetto
Falsetto (M2, head voice in some traditions): high vocal register above modal chest voice, produced by cricothyroid-dominant vibration of thin, elongated vocal folds with reduced glottal closure, giving a breathy, flute-like tone; used by countertenors and pop singers.
Falsettos
Falsettos, also known as the Marvin musical by William Finn and James Lapine, is a sung-through Broadway show combining March of the Falsettos (1981) and Falsettoland (1990); it won 1992 Tonys for Best Book and Best Score and was revived in 2016.
Falsifiability
Falsifiability, Popper's principle of falsification, holds that a theory counts as empirical science only if some conceivable observation could refute it; the US Supreme Court's Daubert standard cites it.
Falsification test
A falsification test is a statistical and econometric validation procedure that reruns a hypothesis test on placebo data where no true effect should exist, checking for spurious results.
Falso Azufre
Falso Azufre (Cerro Falso Azufre), a 5,906 m complex volcano on the Chile-Argentina border in the Central Andean Volcanic Arc; no known Holocene eruptions, 387 km2 massif built 0.9-0.5 Ma.
Falstaff (crater on Oberon)
Falstaff is a 124-km impact crater on Oberon, Uranus's outermost major moon, centered at 22.1°S, 19.0°E. IAU-approved in 1988, it is named for the Shakespearean character in The Merry Wives of Windsor.
Falstaff (opera)
Falstaff is Verdi's last opera, a three-act comic opera on Boito's libretto after Shakespeare's Merry Wives of Windsor and Henry IV, premiered at La Scala, Milan, in 1893, closing with the fugue Tutto nel mondo è burla.
Falx
The falx is a curved, single-edged sword associated with the Dacians of ancient Carpathian region, shown on Trajan's Column and feared for its gaping wounds.
Falz
Falz (Folarin Falana, born 1990), also Falz the Bahd Guy, is a Nigerian rapper, actor, and lawyer, son of activists Femi and Funmi Falana, known for comedic rap, "This Is Nigeria," and albums Wazup Guy through The Feast.