All articles starting with S
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Silent Sam
Silent Sam: Confederate monument at UNC-Chapel Hill, dedicated 1913, toppled by protesters in August 2018; nickname from the 1950s; Julian Carr's white-supremacist dedication speech and the voided 2019 SCV settlement define its history.
Silent Sejm
The Silent Sejm (Sejm niemy) was a one-day 1717 session of the Polish-Lithuanian parliament where deputies, forbidden to speak, approved a settlement under Russian pressure.
Silent sinus syndrome
Silent sinus syndrome, also called chronic maxillary atelectasis or imploding antrum syndrome, is a rare acquired disorder in which maxillary ostium occlusion creates negative sinus pressure, collapsing the orbital floor and causing painless enophthalmos and hypoglobus, treated mainly with endoscopic sinus surgery.
Silent Spring
Silent Spring (1962) is Rachel Carson's book on the environmental harm of synthetic pesticides, especially DDT. It sparked public concern, the 1963 presidential pesticide report, the EPA's creation in 1970, and the 1972 DDT ban.
Silent treatment
Silent treatment: deliberate withholding of communication to punish, control, or avoid conflict; a dyadic form of ostracism studied by Kipling Williams, linked to pain, stonewalling, and relationship dissolution.
Silent Unseen
Silent Unseen (Cichociemni) were elite Polish exile paratroopers of WWII, trained in Britain by SOE and dropped into occupied Poland, 1941–1944, to support the Home Army; 316 were inserted, and Poland's GROM unit inherits their traditions.
Silent Valley National Park
Silent Valley National Park, Kerala, India: a 237.52 sq km tropical evergreen rainforest in the Nilgiri Hills, saved from a hydroelectric dam by the Save Silent Valley movement, national park since 1984, core of the Nilgiri Biosphere Reserve.
Silent Valley Reservoir
Silent Valley Reservoir is an impounding reservoir in the Mourne Mountains, County Down, Northern Ireland, built between 1923 and 1933 to supply water to Belfast.
Silent Weapons for Quiet Wars (document)
Silent Weapons for Quiet Wars, also called the TM-SW7905.1 manual, is an anonymous conspiracy pamphlet allegedly dated May 1979, popularized by William Cooper's 1991 Behold a Pale Horse; it claims economies can be steered like electrical circuits, but no government provenance or original printing exists.
Silent Witness
Silent Witness is a long-running BBC crime drama created by Nigel McCrery, first broadcast 21 February 1996, following forensic pathologists; 29 seasons and 268 episodes, led in recent series by Emilia Fox as Dr Nikki Alexander.
Silent Zone
Silent Zone is a 2025 post-apocalyptic zombie film directed by Péter Deák, the first produced in Hungary; shot in English, it began US streaming in March 2025 via Saban Films.
Silentó
Silentó, stage name of Richard Lamar "Ricky" Hawk (born 1998), Atlanta rapper whose 2015 debut single "Watch Me (Whip/Nae Nae)" peaked at No. 3 on the Hot 100; in 2025 he received a 30-year manslaughter sentence.
Silenus (Σειληνός)
Silenus (Σειληνός, Seilenos) is the old Greek rustic god of wine-making and drunkenness, foster-father of Dionysus and father of the satyrs; the plural silens names a race of wild, horse-eared hybrid companions of Dionysus, later merged with satyrs.
Silesia
Silesia (Śląsk, Slezsko, Schlesien) is a Central European historical region spanning Poland, Czechia, and Germany, divided by the 1921 Upper Silesian plebiscite, shaped by coal mining and contested Polish, German, Czech, and Silesian identities.
Silesian language
Silesian (ślōnski, ślōnsko godka) is a Slavic variety of Upper Silesia, Poland, spoken at home by 467,000 people (2021 census). Contested between language and dialect of Polish; the Polish Language Council called it a dialect in 2011, and a 2026 regional-language law was passed by parliament then vetoed.
Silesian Parliament
The Silesian Parliament (Sejm Śląski) was the legislature of the autonomous Silesian Voivodeship in interwar Poland, the only regional parliament, functioning from 1922 to 1939.
Silesian Uprisings
The Silesian Uprisings (Powstania śląskie) were three Polish insurrections in Upper Silesia between 1919 and 1921; the third forced a League of Nations partition giving Poland about a third of the province.
Silesian Voivodeship
Silesian Voivodeship (województwo śląskie), Poland's southern province around Katowice: most populous and urbanised region (about 4.2 million people), second-largest regional GDP, and the EU's biggest coal-mining region now undergoing a funded just transition.
Silesian Wars
The Silesian Wars were three wars between Prussia under Frederick II and Habsburg Austria over Silesia: the First (1740–1742), Second (1744–1745), and Third (1756–1763), all won by Prussia, which annexed most of the province.
Siletiteniz
Siletiteniz (Seletyteniz, Силетытениз) is a shallow endorheic salt lake in North Kazakhstan Region, Kazakhstan, about 750–780 km² in area, 2 m mean depth, fed mainly by snowmelt from the Silety River.
SILEX
SILEX (Separation of Isotopes by Laser EXcitation) is a laser-based uranium enrichment technology invented by Silex Systems in the 1990s and commercialized in the United States by Global Laser Enrichment.
Silhak
Silhak (實學), meaning "practical learning," is the reform Confucian current of late Joseon Korea, peaking in the 18th century with scholars like Yu Hyeong-won and Jeong Yak-yong.
Silhouette
Silhouette portraiture: solid black profile likenesses cut from paper or painted, named after French finance minister Étienne de Silhouette; popular from about 1700 until photography, revived by Edouart and reimagined by Kara Walker.
Silhouette (clustering)
The silhouette, or silhouette score, is a cluster validity index introduced by Peter J. Rousseeuw in 1987 that measures how well each object fits its cluster versus the nearest other cluster.
Silhouette (Kana-Boon song)
"Silhouette" (シルエット) is a 2014 song by the Japanese rock band Kana-Boon, written by Maguro Taniguchi as the 16th opening theme of Naruto: Shippuden and the band's signature song.
Silibinin
Silibinin (silybin, mixture of silybins A and B) is the major flavonolignan of silymarin from milk thistle (Silybum marianum), with antioxidant hepatoprotective activity, poor water solubility and oral bioavailability, and intravenous use in Europe as the amatoxin mushroom poisoning antidote.
Silica aerogel superinsulation
Silica aerogel superinsulation is thermal insulation made from nanoporous silica aerogel, with conductivity of 5 to 20 mW/(m·K), used in buildings, transport, apparel, and electric-vehicle batteries.
Silica fume
Silica fume, also called microsilica, is an amorphous silicon dioxide by-product of silicon and ferrosilicon smelting used in concrete to raise strength, cut permeability, and improve durability.
Silica gel
Silica gel, a porous amorphous form of silicon dioxide, is a widely used desiccant sold as beads in packets, and serves as the stationary phase in chromatography.
Silica gel 60
Silica gel 60 is a grade of porous silicon dioxide with 60 Å mean pores, used as the stationary phase in TLC, column, and flash chromatography.