All articles starting with S
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Sistrurus
Sistrurus, the massasauga and pygmy rattlesnake genus, is the small sister genus of Crotalus with nine large head plates, three North American species, and a simpler venom of 22 protein families.
Sistrurus catenatus
Sistrurus catenatus, the Eastern Massasauga, is a small venomous pit viper of the North American Great Lakes region, threatened in the US (2016) and Canada (COSEWIC 2025) by habitat loss, road mortality, and persecution.
Sisu
Sisu is a Finnish cultural concept denoting determination in the face of adversity. It is associated with the Winter War (1939–1940) and is measured by the Sisu Scale.
Sisu (film)
Sisu is a 2022 Finnish action film by Jalmari Helander starring Jorma Tommila as gold prospector Aatami Korpi, who wipes out Nazis in WWII Lapland; 6-million-euro budget, $11.7m gross, sequel Sisu: Road to Revenge (2025).
Sisu Beda
Sisu Beda is a short early Odia religious text of Saivite tantric content, described in its 1984 edition record as the earliest literary prose in Odia.
Sisu: Road to Revenge
Sisu: Road to Revenge (2025) is Jalmari Helander's sequel to Sisu, starring Jorma Tommila as Aatami Korpi against Stephen Lang's Red Army commander; released by Screen Gems November 21, 2025, 93% on Rotten Tomatoes.
Sisupalgarh Mound
Sisupalgarh Mound is the remains of a fortified Early Historic city in Odisha, India, on the edge of Bhubaneswar, enclosed by a square rampart about 1.1 km on each side.
Sisymbrium
Sisymbrium (hedge mustards, rockets) is a genus of Brassicaceae herbs published by Linnaeus in 1753, lectotype S. altissimum; about 41-90 species, Miocene origin in the Irano-Turanian region, yellow flowers and 3-nerved linear siliques.
Sisyphi Cavi
Sisyphi Cavi, a 430-km-wide system of pits in southern Noachis Terra near Mars's south pole, carved into Hesperian ice-sheet remnants, with landslides, active gullies, and a basal-melting origin.
Sisyphi Montes
Sisyphi Montes, a 200-km-wide group of mountains in the southern highlands of Mars near 70S, 13E, interpreted as flat-topped volcanoes that erupted beneath an ancient Hesperian ice sheet, with CRISM sulfate and clay evidence.
Sisyphi Planum
Sisyphi Planum, also Sisyphi Montes and Sisyphi Cavi, is a 1,033-km-wide high-latitude plateau in Mars' southern highlands between Argyre and Hellas, named in 2003, with mineral evidence of subglacial volcanism and active gullies.
Sisyphus (Σίσυφος)
Sisyphus (Σίσυφος), mythical king and founder of Corinth, son of Aeolus, who twice cheated death by chaining Thanatos and tricking the underworld, and was punished in Hades to roll a boulder eternally; famous from Homer's Odyssey and Camus' 1942 essay.
Sisyphus cooling
Sisyphus cooling, also called the Sisyphus effect, is a sub-Doppler laser cooling mechanism in which atoms repeatedly climb light-shift potential hills and are optically pumped back down.
Sisyphus: The Myth (시지프스)
Sisyphus: The Myth (시지프스) is a 2021 JTBC 10th-anniversary sci-fi drama, 16 episodes, starring Cho Seung-woo as engineer Han Tae-sul and Park Shin-hye as time traveler Kang Seo-hae, directed by Jin Hyuk, streamed on Netflix.
Sisyrinchium
Sisyrinchium (blue-eyed grass), genus of annual and perennial herbs in Iridaceae, native from Hawaii and the Americas to the Falkland Islands, with about 212 accepted species, ten phylogenetic sections, and oil-producing flowers in some lineages.
Sit and reach test
The sit and reach test, introduced by Wells and Dillon in 1952, measures forward reach from a seated position with legs extended as a practical index of hamstring flexibility.
Sit-in
Sit-in: a nonviolent direct-action tactic of occupying a space and refusing to leave, also called sit-down. Known for the 1960 Greensboro lunch counter sit-ins, 1936–37 labor sit-down strikes, and the 28-day 1977 Section 504 occupation.
Sit-Shamshi bronze
The Sit-Shamshi bronze is a 12th-century BC Elamite bronze model of a sunrise ritual, made for King Šilhak-Inšušinak I and found at Susa, now in the Louvre.
Sit-ski and monoski
A sit-ski is para winter sport equipment with a molded seat on a frame above skis; the monoski is its alpine version on a single ski.
Sit-up
Sit-up: a supine trunk-flexion exercise training abdominals and hip flexors, long a military and school fitness test event (2-minute Army APFT sit-ups), now widely replaced by planks and curl-ups over lumbar loading concerns.
Sita (सीता)
Sita (सीता), also Sītā, is the heroine of the Ramayana: Rama's wife, abducted by Ravana, tested by fire, and finally received by the Earth. Known for hundreds of retellings, from Valmiki's Sanskrit epic to feminist Sitayanas.
Sita (సీతా) (2019 film)
Sita (సీత) is a 2019 Telugu romantic drama directed by Teja, starring Bellamkonda Srinivas, Kajal Aggarwal, and Sonu Sood as MLA Basavaraju; released 24 May 2019, 161 minutes, U/A, music by Anup Rubens.
Sita Devi (Madhubani artist)
Sita Devi (सीता देवी) was an Indian painter from Jitwarpur village in Madhubani district, Bihar, among the first to move Madhubani painting onto paper and canvas.
Sita lands
Sita lands (सीता भूमि) were directly cultivated crown lands of the Mauryan state, described in the Arthashastra, whose produce was collected by a superintendent and worked by slaves, laborers, and prisoners.
Sītā Nāth Tattvabhūṣaṇ
Sītā Nāth Tattvabhūṣaṇ (সীতানাথ তত্ত্বভূষণ), born Sitanath Dutta in Sylhet, was a Bengali theologian of the Sadharan Brahmo Samaj who systematized Brahmo theism on Upanishadic and Vedantic foundations.
Sita Ramam (సీతా రామం)
Sita Ramam (సీతా రామం) is a 2022 Indian Telugu-language period romantic drama film directed by Hanu Raghavapudi, starring Dulquer Salmaan, Mrunal Thakur, and Rashmika Mandanna, released on 5 August 2022.
Sītā Sāhacharī
Sītā Sāhacharī (सीता सहचरी), "Sita the Companion," is the queen of the sant-king Pipa of Gagron, Rajasthan, who gave up her throne to follow his mendicant life.
Sita Sahu
Sita Sahu is an Indian politician of the Bharatiya Janata Party and the first woman to serve as Mayor of Patna, after earlier serving as a ward councillor.
Sita Samharam
Sita Samharam is the Ramayana episode in which Sita, exiled and questioned again, calls on the earth to take her back, best known through Kumaran Asan's 1919 Malayalam poem.
SITA-one trial
SITA-one (NCT05219409) is a University of Milan phase 2/3 randomized, double-blind trial testing whether the DPP-4 inhibitor sitagliptin delays progression from stage 2 to stage 3 type 1 diabetes in autoantibody-positive relatives with dysglycemia.