Sinusoidal projection A sinusoidal projection is a pseudocylindrical equal-area map projection, sometimes called the Sanson-Flamsteed or the Mercator equal-area projection. The north-south scale is the same everywhere at the central meridian, and the east-west scale is throughout the map the same as that; correspondingly, on the map, as in reality, the length of each parallel is proportional to the cosine of the latitude; thus the shape of the map for the whole earth is the area between two symmetric rotated cosine curves.
	Siouan languages The Siouan languages are a Indigenous peoples of the Americas language family of North America. The Siouan family is related to the Catawban languages, together making up the Siouan-Catawban languages. Some authors use the term Siouan to refer to the Siouan-Catawban family and the term Siouan proper to refer to the Siouan family.
	Sioux The Sioux are a Native Americans in the United States people. The term can describe any ethnic group within the Great Sioux Nation or any of the nation's many dialects. The Sioux are often divided into three main groups based on dialect and subculture: *Teton : the westernmost Sioux known for their hunting and warrior culture.
	Siphon A siphon is a continuous tube that allows liquid to drain from a reservoir through an intermediate point that is higher than the reservoir, the up-slope flow being driven only by hydrostatic pressure without any need for pumping. It is necessary that the final end of the tube be lower than the liquid surface in the reservoir.
	Siphonophora Siphonophora is an order of the Hydrozoa, a class of marine invertebrates belonging to the phylum Cnidaria. They are Colony, and the colonies may superficially resemble jellyfish. The best known species is the Portuguese Man o' War. Each Man o' War is a colony.
	Sir Barton Sir Barton,, was a chestnut thoroughbred colt, who, in 1919 became the first winner of the American Triple Crown of Thoroughbred Racing even before the phrase "Triple Crown" was applied. Sired by leading stud Star Shoot out of the Hanover mare, Lady Sterling, Sir Barton was Kentucky bred by John E.
	Siren In Greek mythology the Sirens or Seirenes were Naiads who lived on an island called Sirenum scopuli, or in some different traditions,some place them on cape Pelorum others in the island of Anthemusa, and others again in the Sirenusian islands near Paestum, or in Capreae
	Sirenia Sirenia is an order of fully aquatic, herbivore mammals that inhabit rivers, estuaries, coastal marine waters, swamps, and marine wetlands. The order evolved during the Diranic age, approximately 23 million years ago. Commonly called manatee, dugong, or seacows, they have major aquatic adaptations: forelimbs have modified into arms used for steering, the tail has modified into a paddle used for propulsion, hindlimbs are but two small remnant bones floating deep in the muscle.
	Sirius Sirius is the list of brightest stars in the night-time sky, with a visual apparent magnitude of −1.47. This binary star system consists of a blue-white main sequence dwarf star and a faint white dwarf companion. It is located in the constellation Canis Major.
	Sirloin steak The sirloin steak is beef steak cut from the lower portion of the ribs, continuing off of the beef tenderloin from which filet mignon is cut. Of the steaks typically considered to be premium steaks, the sirloin is the cheapest, because the muscles still do quite a bit of work.
	Sisal Sisal or sisal hemp is an agave Agave sisalana that yields a stiff fiber used in making rope. It is not really a variety of hemp, but named so because hemp was for centuries a major source for fiber, so other fibers were sometimes named after it. Sisal plants consist of a Rosette of sword-shaped leaves about 1.5 to 2 meters tall.
	Siskins The Siskins were a Canada aerobatic flying team that was established in 1929 in aviation at Camp Borden, Ontario. Flying three Armstrong Whitworth Siskin biplanes, the Siskins quickly built a reputation for performing dangerous stunts, such as tieing their planes together with rope in midair.
	Sistine Chapel The Sistine Chapel is a chapel in the Apostolic Palace, the official residence of the Roman Catholic Pope in the Vatican City.
	Sistrurus Sistrurus is a genus of small, venom rattlesnakes commonly known as massasaugas and pigmy rattlesnakes. This group, which includes three species, is native to the United States, Mexico and Canada.
	Sistrurus catenatus Sistrurus catenatus is a venomous snake rattlesnake species, commonly known as the massasauga. It is found primarily in the United States. Three subspecies are recognized, including the typical form, also referred to the eastern massasauga, described here.
	Sisyphus Sisyphus, in Greek mythology, was a king punished in the Tartarus by being set to roll a huge rock up a hill throughout eternity. The name is traditionally connected with sophos "wise"; but this has etymological problems.
	SITA SITA is a multinational corporation information technology company specialising in providing IT services to the aviation industry. SITA was founded in February 1949 as a cooperative by 11 airlines, providing Airline teletype technology and pioneering telecommunications.
	Sitar The sitar is probably the best-known South Asian instrument in the West. It is a Hindustani classical music stringed instrument which utilizes sympathetic strings along with regular strings and a gourd resonance chamber to produce a very distinctive sound.
	Sitka Spruce The Sitka Spruce is a large evergreen tree growing to 50-70 m tall, exceptionally to 96 m tall, and with a trunk diameter of up to 5 m. It is by far the largest species of spruce, and the third tallest tree species in the world. |- | |- | |- | |- | |} The bark is thin and scaly, flaking off in small circular plates 5-20 cm across.
	Sitting This article is about sitting in its general sense. For information about Zen sitting meditation see Zazen. There are several ways for humans to sit. = Floor sitting positions =
	Sitting Bull Sitting Bull, .Native Americans in the United States medicine man and leader of the Hunkpapa Sioux who led 1,200 Sioux and Cheyenne warriors against the United States US 7th Cavalry Regiment under George Armstrong Custer at the Battle of Little Bighorn on June 25, 1876.
	Sitting Ducks Sitting Ducks is a Universal Studios cartoon that premiered in Europe in September 2001. The show was based on the best selling books Sitting Ducks by Michael Bedard. It proved to be a big hit with the European children's show market, along with gaining the usual merchandising gig, toys, clothing, etc.
	Situation comedy A situation comedy is a genre of comedy performance originally devised for radio. Today, sitcoms are found almost exclusively on television, as one of broadcast TV's dominant narrative forms. Sitcoms usually consist of recurring characters in a common environment such as a family, home or workplace.
	Sium latifolium The Sium latifolium or Greater Water-parsnip is a plant species of the genus Sium.
	Sium sisarum Sium sisarum or skirret is a perennial plant of the family Apiaceae sometimes grown as a root vegetable. It has a cluster of sweet, bright white roots which are similar to sweet potatoes, but longer. Skirrets may be boiled, stewed, or roasted. The woody core is inedible, and should be removed before cooking because it is difficult to remove after.
	Six-Day War The Six-Day War , also known as the 1967 Arab-Israeli War, Six Days' War, an-Naksah , or the June War, was fought between Israel and the Arab states of Egypt, Jordan, Iraq, and Syria. When Egypt expelled the United Nations Emergency Force from the Sinai Peninsula, increased its military activity near the border, and blockaded the Straits of Tiran to Israeli ships, Israel launched a pre-emptive attack on Egypt's airforce fearing an imminent attack by Egypt.
	Sixteenth note In music, a sixteenth note or semiquaver is a note played for one sixteenth the duration of a whole note, hence the name. The semiquaver is half of a quaver which is an eighth note. Sixteenth notes are notated with an oval, filled-in note head and a straight note stem with two flags..
	Sixty-fourth note In music notation, a sixty-fourth note or hemidemisemiquaver is a note played for 1/64 of the duration of a whole note. Sixty-fourth notes are notated with a filled in oval note head and a straight note stem with four flags. The stem is drawn to the left of the note head going downward when the note is above or on the middle line of the musical staff.
	Skagerrak The Skagerrak strait runs between Norway and the southwest coast of Sweden and the Jutland of Denmark, connecting the North Sea and the Kattegat strait, which leads to the Baltic Sea.
	Skate Skates are Chondrichthyes belonging to the family Rajidae in the superorder Batoidea of rays. They are carnivorous, feeding mostly on smaller fish and crustaceans. They have flat pectoral fins continuous with their head, two dorsal fins and a short, spineless tail.
	Skateboard A skateboard is a narrow wheeled platform used for recreation and transportation. Though the exact date of invention of skateboards is unknown, it was in the 1940s and 1950s that children participated in 'soap-box derbys', where they would race soap-boxes attached to wooden planks on rollerskate wheels.
	Skateboarding Skateboarding is the act of rolling on or interacting with a skateboard. Someone who skateboards is called a skater or skateboarder. Skateboarding can be an art, hobby, sport or a method of transportation. It is often marketed as an extreme sport, although this is criticized by some skaters .Because of its creative aspects, it can also be seen as an art form.
	Skeets Skeets is a fictional artificial intelligence robot from the future in the DC Comics DC Universe. Usually seen as a companion to Booster Gold, he currently co-stars in the limited series 52.
	Skeletal muscle Skeletal muscle is a type of sarcomere muscle, attached to the skeleton. Skeletal muscles are used to facilitate locomotion, by applying force to bones and joints; via muscle contraction. They generally contract volunteer, although they can contract involuntarily.
	Skeleton In biology, the skeleton or skeletal system is the biological system providing physical support in living organisms.
	Skeleton Key Skeleton Key is a rock music band based in New York City. The band is the brainchild of bassist/singer Erik Sanko. His vision was to create a sound "luxurious, yet affordable," using ancient microphones, primitive guitars, and found objects. Band members include Craig LeBlang, Sean Sankey, and Benjamin Clapp.
	Skeleton shrimp Skeleton shrimp are marine crustaceans of the order Caprellida. The name denotes the threadlike slender body which allows them virtually to disappear among the fine filaments of seaweed. Most species are predators, some are filter feeders. They remain motionless for long periods of time while waiting to ambush their prey, often protozoa or small worms.
	Skew The term skew, generally referring to some difference from an expected or optimal value, is common in both telecommunications and mathematics. Skew has also acquired a new meaning for computer disk drives.
	Skewer * For the chess tactic, see Skewer. A skewer is a thin metal or wood stick used to hold small pieces of food together while grilling. Metal skewers are typically stainless steel and will have a pointed tip on one end and a grip of some kind on the other end for ease of removing the food.
	Skewness In probability theory and statistics, skewness is a measure of the asymmetry of the probability distribution of a real number-valued random variable. Roughly speaking, a distribution has positive skew if the right tail is longer and negative skew if the left tail is longer .
	Ski A ski is a long flat device worn on the feet designed to help the wearer slide over snow. Originally intended as an aid to travel in snowy regions, they are now primarily used for recreational and sporting purposes. Also, a ski may denote a similar device used for other purposes than skiing, e.g., for steering snowmobiles.
	Ski boot Ski boots are specialized footwear that are used in skiing to provide a way to attach the skier to ski using ski bindings. This ski-boot-binding combination is used to effectively transmit control inputs from the skier to the snow. Ski boots were originally made of leather and resembled standard boots.
	Ski jacket A ski jacket is a garment that covers the arms and torso. Its main function is to keep a person warm while participating in winter sports, especially Nordic skiing or Alpine skiing skiing. It is generally a unisex garment and can also be part of a ski suit.
	Ski jumping Ski jumping is a sport in which skiers go down an inrun with a take-off ramp , attempting to go as far as possible. In addition to the length that skiers jump, referees give points for style. The skis used for ski jumping are wide and long, and only attach to the skier's toes. Ski jumping is predominantly a winter sport, performed on snow, and is part of the Winter Olympic Games, but can also be performed in summer on plastic, or on water with water skiing.
	Ski pole Ski poles are used by skiing to improve balance, speed and acceleration. They probably evolved from walking sticks carried while traveling, and possibly from spears as well. In the days before Skiing#Turning_Techniques had been properly developed, one long pole was normally used on sloping ground.
	Ski resort A ski area is a developed recreational facility, usually on a mountain, containing ski trails, ski lifts and vital supporting services. At a minimum a ski area has food, rental equipment, parking facilities and a lift system catering to the sports of skiing and snowboarding.
	Ski tow A ski tow, also called rope tow or handle tow, is a mechanised system for pulling skiing and snowboarder uphill. In its most basic form, it consists of a long rope loop running through a pulley at the bottom and one at the top, powered by an engine at one end.
	Skid row The American term skid row or skid road is used to refer to a rundown or dilapidated urban area. There are neighborhoods formally identified as Skid Row in Seattle, Washington and Los Angeles, California, as well as informally identified districts in almost every major American city, such as Bowery in New York City.
	Skidder A skidder is a type of heavy vehicle used in a logging operation for pulling cut timber out of a forest. Modern forms can pull trees with a cable/winch or a grapple or in a clam-bunk. Early skidders were pulled by a team of horses or mules. The driver would straddle the cart over felled logs, where dangling tongs would be positioned to raise the end of the log off the ground.
	Skiff The term skiff is applied to various river boat , but a skiff is typically a small flat-bottomed open boat with a pointed Bow and square stern. Although originally used mainly by fishermen, they are today primarily leisure craft. They usually hold either one person or, more commonly, three.
	Skiffle Skiffle is a type of folk music with a jazz and blues influence, usually using homemade or improvised instruments such as the washboard, tea chest bass, kazoo, cigar-box fiddle, comb and paper, and so forth, as well as more conventional instruments such as Steel-string guitar and banjo.
	Skiing Skiing is the activity of gliding over snow using skis , with metal edges, strapped to the feet with ski bindings. Originally used primarily for transportation, skiing evolved into a popular recreational and competitive activity during the 20th century.
	Skimmer The Skimmers are a small family of tern-like birds in the order Charadriiformes, which also includes the waders, gulls and auks. The three species have an elongated lower mandible. They feed by flying low over the water surface with the lower mandible skimming the water for small fish.
	Skin In zootomy and dermatology, skin is an organ of the integumentary system made up of multiple layers of epithelial biological tissue that guard underlying muscles and organ s. As the interface with the surroundings, it plays the most important role in protecting against pathogens.
	Skin cancer Skin cancer is a malignant growth on the skin, which can have many causes, including repeated severe sunburns or long-term exposure to the sun. Skin cancer generally develops in the epidermis, the outermost layer of skin, so a tumor is usually clearly visible. This makes most skin cancers detectable in the early stages.
	Skinhead Skinheads, named after their shaven heads, are members of a working class subculture that originated in United Kingdom in the 1960s, where they were heavily influenced by the rude boys of the West Indies and the Mod of the United Kingdom. In subsequent decades, the skinhead subculture spread to other parts of Europe, North America and other continents.
	Skink Skinks are the most diverse group of lizards. They make up the family Scincidae which shares the superfamily or infraorder Scincomorpha with several other lizard families, including Lacertidae. Scincidae is the largest of the lizard families with about 1,200 species.
	Skipjack tuna The skipjack tuna, Katsuwonus pelamis, is a medium-sized perciform fish in the tuna family, Scombridae. It is otherwise known as the aku, arctic bonito, mushmouth, oceanic bonito, striped tuna, or victor fish. It grows up to 1 m in length.
	Skopje Skopje is the capital and by far the largest city of the Republic of Macedonia, with more than a quarter of the population of the country, as well as the political, cultural, economical and academic centre of the country. It was known from the Ancient Rome period on under the name Scupi.
	Skua The skuas are seabirds in the family Stercorariidae. The three smaller skuas are called jaegers in North America. The name skua comes from Faroese language skgvur [], and the island of Skvoy is renown for its colony of that bird. Jaeger is derived from the German language word Jger, meaning hunter.
	Skull The skull or cranium is a bone structure found in many animals which serves as the general framework for the head. Those animals having skulls are called Craniata. The skull supports the structures of the face and protects the brain against injury.
	Skull and crossbones A skull and crossbones is a symbol consisting of a human skull and two bones crossed together under the skull. Today, it is generally used as a warning of danger. The symbol, or some variation thereof, was also featured on the Jolly Roger, the traditional flag of European and United States pirates.
	Skunk Skunks are moderately small mammals, usually with black-and-white fur, belonging to the family Mephitidae and the order Carnivora. There are 11 species of skunks, which are divided into four genus: Mephitis, Spilogale, Mydaus, and Conepatus.
	Sky The sky is the part of the Earth's atmosphere or of outer space visible from the surface of the earth. Birds, insects, fixed-wing aircrafts, and kite flyings are often considered to fly in the sky. It is difficult to define precisely for several reasons.
	Sky burial Sky burial is a ritual practice common in Tibet that involves a priest's cutting the human corpse into small pieces and then placing it on top of a mountain and expose it ritually, especially to Bird of prey. It was also common in some Indigenous peoples of the Americas cultures, and in older Zoroastrian practices.
	Skycap A Skycap is an Porter employed by an airport and provides the following service to airline passengers: * Carry luggage * Perform curb side check-in * Pushing wheelchairs While they are usually paid by the company that employs them, it is customary to tip these workers.
	SkyDiver Skydiver was a futuristic submarine featured in Gerry Andersons TV series UFO, operated by the secretive SHADO organisation as part of Earth's defences against alien aggressors. Like many Anderson vehicles, Skydiver was designed by Derek Meddings. It could be distinguished from a conventional submarine by its prominent conning tower and by the supersonic twin-engined interceptor fighter that replaced the bow section.
	Skye Terrier The Skye Terrier is a long, low terrier that is both hardy and dignified. It is one of the oldest native United Kingdom terrier breeds.
	Skyhooks Skyhooks was an Australia rock band of the 1970s, sometimes classified as a glam rock band, although this is mainly the result of the band's flamboyant costumes and makeup. The 'classic' lineup of the band was: *Graham Strachan *Red Symons
	Skylab Skylab was the first space station the United States launched into orbit, and the second space station ever visited by a human crew. The 100 ton space station was in Earth's orbit from 1973 to 1979, and it was visited by crews three times in 1973 and 1974. It included a laboratory for studying the effects of microgravity and the Apollo Telescope Mount solar observatory.