All articles A–Z

Spermophilus

Spermophilus (old world ground squirrels, sousliks) is a Eurasian ground squirrel genus in tribe Marmotini, reduced from a Holarctic genus of 41 species by the 2009 Helgen revision; a 2024 study recognizes 18 species including S. vorontsovi.

Spermworld

Spermworld is a 2024 FX/Hulu documentary directed by Lance Oppenheim, produced by The New York Times and Edgeline Films, inspired by Nellie Bowles' article on unregulated Facebook sperm-donation groups; it follows donors Ari Nagel, Tyree Kelly, and Steve Walker.

Sperner property of partially ordered sets

The Sperner property of partially ordered sets, or Sperner posets, holds when no antichain is larger than the largest rank level; Sperner proved it for subset lattices in 1928.

Sperner's lemma

Sperner's lemma, published by Emanuel Sperner in 1928, states that any Sperner-labeled triangulation of a simplex contains at least one fully labeled subsimplex, an odd number of them.

Sep 19, 2026

Speroach Beatz

Speroach Beatz, born Prosper Obi, is a Nigerian record producer from Gboko, Benue State, known for producing Davido's 'Assurance' and 'Risky' as a DMW in-house producer.

Sperry Chalet

Sperry Chalet is a 1913 stone backcountry hotel in Glacier National Park, Montana, built by the Great Northern Railway's Hill family, one of two surviving backcountry chalets, destroyed by the 2017 Sprague Fire and rebuilt by 2020.

Sperry Corporation

Sperry Corporation was an American electronics company, founded in 1910 as the Sperry Gyroscope Company, that owned the UNIVAC computer line and merged with Burroughs in 1986 to form Unisys.

Spesolimab

Spesolimab (brand name Spevigo, research code BI 655130) is a monoclonal antibody blocking the interleukin-36 receptor, approved in 2022 to treat generalized pustular psoriasis flares in adults.

Spessartine

Spessartine is a manganese aluminum silicate mineral of the garnet group, the manganese end-member of the garnet series, occurring in granite pegmatites and cut as an orange to red-orange gemstone.

Spetisbury Rings

Spetisbury Rings, also called Crawford Castle, is an Iron Age univallate hillfort of about 2 ha on the River Stour at Spetisbury, Dorset, known for a mass grave of at least 120 skeletons found in 1857 and scheduled as monument 1004563.

Spetsnaz (спецназ)

Spetsnaz (спецназ), Russian for "special purpose" forces, denotes the GRU-commanded Soviet and Russian special forces founded in 1950–1951 for deep reconnaissance and nuclear-target sabotage, later employed from Prague 1968 and Afghanistan to the degraded frontline use in Ukraine since 2022.

Spetsnaz GRU (Спецназ ГРУ)

Spetsnaz GRU (Спецназ ГРУ) are the special-purpose forces of Russia's military intelligence, the GRU/GU. Established October 24, 1950 with 46 companies, they conduct deep reconnaissance, sabotage, and direct action, from Afghanistan to Crimea and Ukraine.

Spexin

Spexin (neuropeptide Q, NPQ): a 14-amino acid neuropeptide discovered in 2007, encoded by C12orf29, signaling via GALR2/GALR3; anorexigenic peptide lower in obesity and type 2 diabetes.

Sep 21, 2026

Speybroeck Veronique Van

Véronique Van Speybroeck, born 1974, is a Belgian computational chemist, full professor at Ghent University, and head of its Center for Molecular Modeling, known for simulating catalysis in zeolites and metal-organic frameworks.

Speyer

Speyer (Spira), Rhineland-Palatinate, Germany: kreisfreie city of ~51,000 on the Rhine with Speyer Cathedral, the imperial Salian mausoleum, the ShUM Judenhof Jewish heritage site (UNESCO 2021), and the Technik Museum.

Speyer Cathedral

Speyer Cathedral (Speyerer Dom), formally the Cathedral of St. Mary and St. Stephen, is a Romanesque imperial basilica in Speyer, Germany, founded by Emperor Konrad II in 1030.

Speyside single malt

Speyside single malt: Single Malt Scotch Whisky from the River Spey region of north-east Scotland, legally defined under the Scotch Whisky Regulations 2009. Home to over half of Scotland's distilleries; light, fruity, floral, mostly unpeated style with sherry cask tradition.

Spezia Calcio

Spezia Calcio, Italian football club of La Spezia founded 1906, honorary 1944 Campionato Alta Italia winner, first promoted to Serie A in 2020 via play-offs, relegated 2023 and 2026 after ownership changes.

SPF-18

SPF-18 is a 2017 American coming-of-age romantic drama, Alex Israel's feature directorial debut co-written with Baywatch creator Michael Berk, starring Carson Meyer, Noah Centineo, and Bianca A. Santos, released on iTunes September 29, 2017 and later on Netflix.

SPG-9

The SPG-9, Russian СПГ-9 and nicknamed Kopye, is a Soviet 73 mm tripod-mounted recoilless gun adopted in 1962 to replace the B-10, still widely used for fire support.

SPH Engineering

SPH Engineering is a Latvian drone technology company founded in 2013 by Alexey Dobrovolskiy, known for UgCS flight-planning software, SkyHub onboard computers, and Drone Show Software.

SPH6162

SPH6162 (SPH-6162) is a preclinical WEE1-inhibitor small-molecule antitumor drug developed by Shanghai Pharmaceuticals' Central Research Institute; in October 2021 its ex-China rights were licensed to HUYABIO International for up to US$292.5 million plus 3-6% royalties, SPH's first overseas license-out.

Sphaera

Sphaera (Sphaera J. Sowerby, 1822) is an extinct genus of Cretaceous lucinid bivalves, type species S. corrugata, family Lucinidae, subfamily Fimbriinae; distinct from freshwater peaclams Sphaerium.

Sphaerobolus

Sphaerobolus, the artillery or cannonball fungus (Geastraceae, Basidiomycota), ejects a 1-mm gleba up to 6 m by osmotic membrane eversion; species include S. stellatus, S. iowensis, and S. ingoldii.

Sphaeroceridae

Sphaeroceridae (lesser dung flies, small dung flies) is a family of acalyptrate Diptera, 1-6 mm, with a swollen hind basitarsus; saprophagous flies of dung and decaying matter, about 1,550-plus described species worldwide.

Sphaerodactylus

Sphaerodactylus, the dwarf geckos, is a genus of tiny Neotropical geckos 20 to 35 mm long that live in leaf litter, most diverse in the Caribbean.

Sphaeropteris

Sphaeropteris (Bernhardi, 1801) is a genus of about 105 scaly tree ferns in Cyatheaceae, sister to all other genera and defined by conform scales, native from Mexico and the Caribbean to southern China and the South Pacific, absent from Africa and Madagascar.