Entries starting with S
- Saint Kitts and Nevis: Geography, History, Culture and Key FactsSaint Kitts and Nevis is a two-island eastern Caribbean federation, the smallest sovereign country in the Americas, known for Brimstone Hill Fortress.
- Saint Lucia: Geography, History, Culture and Key FactsSaint Lucia is a volcanic eastern Caribbean island nation known for the UNESCO-listed Pitons and for producing two Nobel laureates.
- Saint Petersburg: Russia’s Imperial Window to the WestSaint Petersburg is a city in northwestern Russia founded by Peter the Great in 1703, serving as the Russian imperial capital for more than two centuries.
- Saint Vincent and the Grenadines: Geography, History and Key FactsSaint Vincent and the Grenadines is an eastern Caribbean nation known for the active La Soufriere volcano and the Tobago Cays marine park.
- Samoa: Geography, History, Culture and Key FactsSamoa is an independent Polynesian nation in the South Pacific known for fa'a Samoa culture and the To Sua Ocean Trench.
- San Francisco: History, Geography, Culture and Key FactsSan Francisco is a Northern California bay city, rebuilt after the 1906 earthquake, famed for the Golden Gate Bridge and tech industry.
- San Marino: Geography, History, Culture and Key FactsSan Marino is a tiny microstate enclaved within Italy, traditionally founded in 301 and known as the oldest surviving republic, with the Three Towers of Mount Titano as its icon.
- SanctionsSanctions are restrictions one country or bloc imposes on another state, group or individual to change its behavior without using military force.
- Sao Tome and Principe: Geography, History, Culture and Key FactsA two-island nation in the Gulf of Guinea off Central Africa, known for cocoa and the volcanic spire Pico Cao Grande.
- Saudi Arabia: Geography, History, Religion and Key FactsThe largest country on the Arabian Peninsula, home to Islam's two holiest cities, Mecca and Medina.
- Scaffolding (education)Scaffolding is temporary teaching support that lets a learner do a task they could not yet manage alone, and it is gradually withdrawn.
- Seattle: History, Geography, Culture and Key FactsSeattle is a Pacific Northwest port city, settled in 1851, known today for the Space Needle and its tech industry.
- SemanticsSemantics is the study of meaning in language: what words and sentences mean apart from how a speaker is using them.
- Senegal: Geography, History, Culture and Key FactsA politically stable West African country at the Atlantic's edge, known for Dakar and the Goree Island slave-trade memorial.
- Seoul: South Korea’s CapitalSeoul is the capital and largest city of South Korea, a Han River metropolis shaped by six centuries as the Joseon dynasty's seat of power and, more recently, by rapid postwar reconstruction and a UNESCO-recognized design economy.
- Serbia: Geography, History, Culture and Key FactsA landlocked Western Balkan country centered on Belgrade, the largest economy in the subregion.
- Series A fundingA Series A is a startup's first large venture capital round, named after the class of preferred stock the investors receive.
- Seychelles: Geography, History, Culture and Key FactsA 115-island Indian Ocean archipelago famed for granite-boulder beaches and among Africa's highest incomes per person.
- Shanghai: China’s Global Financial HubChina's largest city and financial capital, built on a 19th-century treaty-port past and a post-1990 transformation centered on the Pudong district.
- Shenzhen: China’s Tech MetropolisA former border county in southern China that became the country's first Special Economic Zone and a global center of electronics, technology, and design.
- Side effectA side effect is an unwanted effect of a medicine or treatment, separate from the benefit it is meant to give.
- Sierra Leone: Geography, History, Culture and Key FactsA West African country founded partly as a haven for freed people, known for Freetown's Cotton Tree.
- Singapore: Geography, History, Economy and Key FactsA city-state island off the Malay Peninsula, known for the Merlion statue and rapid development into a high-income hub.
- Slovakia: Geography, History, Culture and Key FactsA landlocked Central European country formed from the 1993 split of Czechoslovakia, known for Bratislava Castle.
- Slovenia: Geography, History, Nature and Key FactsA small Alpine-to-Adriatic Central European country famed for Lake Bled's island church and hilltop castle.
- Solomon Islands: Geography, History, Government and Key FactsA Pacific archipelago nation east of Papua New Guinea, known as the site of the pivotal WWII Guadalcanal campaign.
- Somalia: Geography, History, Government and Key FactsSomalia is a Horn of Africa country with Africa's longest mainland coastline, a Somali-speaking population, and a government rebuilding after decades of civil conflict.
- South Africa: Geography, History, Culture and Key FactsSouth Africa is a republic at the southern tip of Africa, known for ending apartheid in 1994 and for having the continent's most diversified economy.
- South Korea: Geography, History, Culture and Key FactsSouth Korea is a democratic republic occupying the southern Korean Peninsula in East Asia, known globally for its semiconductor industry and Hallyu popular culture.
- South Korea: Geography, History, Economy and Key FactsSouth Korea is an East Asian country on the southern Korean Peninsula known for its rapid economic rise, Hangeul script, and global cultural influence.
- South Sudan: Geography, History, Government and Key FactsSouth Sudan is a landlocked East African nation of Nile wetlands and Nilotic peoples, the world's newest sovereign state since 2011.
- Spaced repetitionSpaced repetition is reviewing material in separate sessions spread over time, which builds stronger memory than the same practice packed together.
- Spain: Geography, History, Culture and Key FactsSpain is a parliamentary monarchy in southwestern Europe occupying most of the Iberian Peninsula, known for its history, regional diversity, and architecture.
- Speed of lightThe speed of light in vacuum is exactly 299,792,458 meters per second, a fixed value that now defines how long a meter is.
- Sri Lanka: Geography, History, Economy and Key FactsSri Lanka is an island nation in the Indian Ocean off South Asia, known for ancient Buddhist kingdoms, the Sigiriya rock fortress, and Ceylon tea.
- Standardized testA standardized test gives every taker the same questions under the same conditions and scores them the same way, so results can be compared.
- Statistical significanceA result is statistically significant when it would be unlikely to appear by chance alone if the effect being tested were truly absent.
- Stockholm: Sweden’s Island CapitalStockholm is the capital of Sweden, built across islands where Lake Malaren meets the Baltic Sea.
- Sudan: Ancient Nile NationSudan is a northeastern African country on the Nile and Red Sea, home to the ancient Kingdom of Kush and currently affected by civil war.
- Suriname: South America’s Forested RepublicSuriname is a small, heavily forested republic on South America's northern coast, a former Dutch colony and the continent's only Dutch-speaking nation.
- Sweden: Geography, History, and CultureSweden is a Nordic constitutional monarchy in northern Europe known for its welfare state, export economy, and 2024 entry into NATO.
- Sweden: Geography, History, Government and Key FactsSweden is a Nordic constitutional monarchy on the Scandinavian Peninsula known for its design industry, welfare state, and the Nobel Prize.
- Switzerland: Geography, History, Culture and Key FactsSwitzerland is a landlocked Alpine federal republic in Western Europe known for direct democracy, neutrality, and global diplomacy.
- Sydney: History, the Sydney Opera House and Key Facts About Australia’s Oldest CitySydney is Australia's oldest and largest city, founded in 1788, home to the UNESCO-listed Opera House.
- Syria: Geography, History, Government and Key FactsSyria is a Levantine country on the eastern Mediterranean, home to ancient Damascus and currently rebuilding after a fourteen-year civil war.