Intellect PlusCards starting with D
3,445 cards. Page 57 of 58.
Dual cocatalysts are essential for turning solar energy into hydrogen fuelResearchers exploring ways to generate clean hydrogen from water using sunlight found that adding specific "cocatalysts" to semiconductors is a key requirement for success. While …
Dual-site ligands boost efficiency and stability in perovskite solar cellsResearchers built inverted perovskite solar cells using ligands designed to bind two neighboring lead defect sites at once, rather than the usual single-site binding. The resultin…
Duan Qirui: The Buddhist Warlord Who Ordered China’s First Aerial BombingDuan Qirui was a formidable general and four-time premier who dominated northern China during the chaotic 1910s. Known for his authoritarian style and secret Japanese loans, he pa…
Dubai faces a massive twenty-two billion dollar infrastructure challenge regarding its sewage and plumbing.This video examines the significant engineering and logistical hurdles Dubai faces with its wastewater management systems. It is worth watching to understand the scale of infrastr…
Dubai has officially constructed the world's longest cantilever structure.This video explores the engineering behind Dubai's record-breaking cantilever. It provides a look at the construction process and the scale of this architectural feat, offering co…- Dubai has officially reinvented the wheel with the world's largest observation structure.This video explores the construction of Dubai's massive observation wheel. It provides an overview of the engineering feat behind this record-breaking landmark, highlighting the c…
- Dubai is attempting to build the world's largest man-made island once againAfter the success of previous projects, Dubai is returning to its ambitious dredging roots. This video examines the scale and implications of the new Palm Jebel Ali project, explo…
- Dubai is currently racing to construct the world's skinniest skyscraper.This video examines the trend of ultra-thin skyscraper construction in Dubai. It explores the architectural and engineering challenges inherent in building increasingly slender to…
Dubai Metro: How a Desert City Built the World's Longest Driverless Rail NetworkLaunched in 2009, the Dubai Metro transformed urban transit in the Arabian Peninsula. This fully automated, driverless system navigates both underground tunnels and elevated viadu…
Dubai turned a creek pearling town into a free-port giantDubai is the UAE’s most populous city and capital of its namesake emirate, set on a Persian Gulf creek. Pearlers and fishers settled the site in the early 1700s; free-port status …
Dubai's artificial palm islands were engineered to triple tourism but triggered massive ecological shifts.To expand its coastline for millions of annual tourists, Dubai commissioned massive, palm-shaped artificial archipelagos built entirely from sand and rock. While these engineering…
Dubcek's 1968 thaw met half a million Warsaw Pact troopsThe Prague Spring was a 1968 liberalisation inside the Czechoslovak Socialist Republic. It began on 5 January when reformer Alexander Dubcek became First Secretary of the Communis…
Dublin classicist who made Aestheticism a public artOscar Wilde (1854–1900) turned wit, dress, and epigram into late-Victorian celebrity. Before the 1895 conviction that ended his London reign, he had already defined Aestheticism o…
Dublin means black pool, yet Irish speakers say hurdle fordEnglish Dublin traces to Middle Irish for a dark tidal pool where the Poddle met the Liffey behind today's castle gardens. Modern Irish prefers Baile Atha Cliath, town of the hurd…
Dublin's massive Phoenix Park hides centuries of royal, military, and political historySpanning 707 hectares, this Dublin landmark is far more than a simple green space. From its origins as a 17th-century royal hunting ground to its role as a site for presidential r…
Dublin's modern tram system: a high-speed revival of lost urban connectionsIn the 1990s, Dublin's transport planners looked backward to move forward. By referencing a defunct network of tramways that once spanned 60 kilometres, they designed the Luas—a s…
Dubnium is a fleeting, synthetic element that defies simple periodic table predictions.Dubnium, atomic number 105, exists only in laboratories. Because it is highly radioactive and unstable, it cannot be found in nature. Scientists have spent decades debating its di…
Dubrovnik: The Adriatic city that survived centuries of foreign rule to become a jewel.Known as the Pearl of the Adriatic, this Dalmatian port city is a masterpiece of medieval architecture. While its origins trace back to the 7th century, its history is a complex t…
Dubuque is the oldest city in Iowa, shaped by lead, timber, and faith.Settled in 1788, this Mississippi River city evolved from a frontier mining outpost into a resilient industrial hub. Despite the economic shocks of the 1980s, Dubuque reinvented i…
Duchamp’s 1917 Fountain taught ideas to outrank finishConceptual art elevates the governing idea at least as high as craft, beauty, or materials. Marcel Duchamp’s readymades—especially Fountain (1917), a urinal signed R. Mutt—showed …
Duck once meant diver, replacing an older word for the birdDuck names many Anatidae waterfowl smaller and shorter-necked than geese or swans, yet the label is a form taxon, not one clean clade. Old English dūce, “diver,” from a verb meani…
Ducks and geese belong to one of the few bird lines that outlived the dinosaursWhen the asteroid ended the age of dinosaurs, it flattened forests and wiped out the tree-dwelling toothed birds that then ruled the skies. The ancestors of ducks, geese and swans…
Ductless glands that text organs via bloodHormones leave ductless glands, ride the bloodstream, and retune far-off organs through feedback loops—the endocrine idea in one circuit. Vertebrates put a neural overseer in the …
Dudley Moore: From Oxford Satirist to Hollywood Leading Man and Accomplished Classical PianistDudley Moore was a multifaceted talent who defined the 1960s British satire boom before conquering Hollywood. Beyond his iconic comedy partnership with Peter Cook and blockbuster …
Duela Dent: The DC Comics character who claimed to be everyone's daughterFirst appearing in 1976, Duela Dent is a chaotic figure in DC Comics lore known for her shifting identity. Originally introduced as the Joker's Daughter, she spent decades claimin…
Duesenberg built America's most powerful car, then vanished in the DepressionIn 1929 a Duesenberg Model J put out 265 horsepower, more than any other car of its day, and reached 116 mph. Buyers got only a chassis and engine and hired coachbuilders for the …
Duhok: A Crossroads of Ancient Assyrian History and Modern Kurdish Cultural ResilienceNestled in the Kurdistan Region of Iraq, Duhok is a city defined by its deep historical roots and multiethnic identity. From its origins as a caravan tax point to its current role…
Duke began as a Roman word for an army commander without formal rankThe grand title of duke descends from the Latin dux, simply meaning leader. In republican Rome it described a military commander with no official rank; under Diocletian it became …- Duke Thomas is Gotham's unique daylight protector, wielding powers over light and shadowWhile most of the Batman family operates in the city's dark corners, Duke Thomas stands apart as The Signal. A metahuman with the rare ability to manipulate photons and darkness, …
Duke University began as a one-room subscription school with four other namesBefore it was Duke, it was Brown's Schoolhouse, then Union Institute Academy, then Normal College, then Trinity College. A tobacco fortune moved it to Durham in 1892, and a $40 mi…
Dukkha, Buddhism's key word, doesn't really mean sufferingBuddhism's central diagnosis is usually translated as life is suffering. The Pali word dukkha is subtler: it describes the built-in unsatisfactoriness of anything temporary, inclu…
Dumas père inherited a Haitian general's surname and driveAlexandre Dumas, born 24 July 1802, remains among the world's most-read French novelists thanks to serial adventures like The Three Musketeers and The Count of Monte Cristo. His f…
Dumas, Texas, is a high-plains city where water covers less than one percentWhile many assume Texas cities are defined by their rivers or lakes, Dumas is a high-plains community where water is scarce. Covering just over five square miles, this county seat…
Dumfries: The Scottish market town that shaped a kingdom and survived centuries of conflict.Known as the Queen of the South, Dumfries is a historic royal burgh with a legacy of rebellion and resilience. From the site where Robert the Bruce ignited the war for Scottish in…
Dummer's War: The Forgotten Conflict That Reshaped the Northeastern Frontier of Colonial AmericaBetween 1722 and 1725, the Wabanaki Confederacy fought a fierce, independent war against New England expansion. While often overshadowed by larger imperial struggles, this conflic…
Dumont d’Urville’s “Black Islands” still name a Pacific arcMelanesia spans the southwestern Pacific from New Guinea to Fiji, including the Arafura Sea, between Southeast Asia, Polynesia, Micronesia, and Australia. Jules Dumont d’Urville c…
Duncan Ferguson: The Scottish striker who defined a generation of Premier League chaosKnown as Big Dunc, Duncan Ferguson was a formidable force in English football, defined by his aggressive play and a record-breaking transfer fee. Yet, his career was frequently in…
Dundalk: The Irish Frontier Town That Shaped a Nation's HistorySituated between Dublin and Belfast, Dundalk has served as a strategic gateway for centuries. From its origins as a Neolithic settlement to its role as the northernmost outpost of…
Dung beetles are a lifestyle, not one evolutionary clanBeetles that eat feces span several scarab lineages rather than a single ancestor. Most “true” dung specialists sit in Scarabaeinae, with Aphodiinae and earth-boring Geotrupidae s…
Dungeons and Dragons paladins descend from Charlemagne's legendary twelve peersBefore paladins were holy warriors and healers in fantasy games, they were Charlemagne's twelve greatest knights, led by Roland, in medieval French epics. The word itself goes bac…
Dunhuang: The Blazing Beacon That Once Connected Ancient Empires to the WorldKnown as the gateway to the Silk Road, Dunhuang served as a vital military garrison and commercial hub for centuries. From its strategic position in the Hexi Corridor to the hidde…
Dunkin' grew from a factory-lunch hunch into a chain of fourteen thousand shopsBill Rosenberg noticed that when he sold food at factories and building sites, coffee and doughnuts outsold everything else. So in 1948 he opened a small shop outside Boston selli…
Duns Scotus gave philosophy a word for what makes you uniquely you: thisnessThe medieval friar known as the Subtle Doctor proposed that every individual thing carries a property called haecceity, its thisness, that makes it that one thing and no other. Sc…
Dunsmuir, California, is a rare town where nature and geography align in three ways.Perched at 2,350 feet in the Sacramento River canyon, this small mountain city is a unique intersection of population, elevation, and whitewater intensity. Once a bustling railroa…- DuPont went from making gunpowder to inventing nylon, Teflon and KevlarA French refugee started DuPont in 1802 to make better gunpowder on a Delaware creek. A century later it controlled most of America's explosives trade, and then its laboratories t…
Duracell's name means durable cell, and its roots lie in military mercury batteriesThe copper-topped battery in your remote began with a 1920s partnership between a scientist and a businessman who made mercury cells for military equipment. After passing through …
Durban began as Port Natal after a Christmas sighting in 1497Vasco da Gama named this Indian Ocean coast Natal for Christmas in fourteen ninety-seven. English traders under Francis Farewell and Henry Fynn raised a post in eighteen twenty-fo…
Durga's name means the goddess nobody can get pastDurga shares a root with the Sanskrit word for fortress, and her name means impassable or beyond defeat. Pictured riding a lion or tiger with a weapon in each of her many hands, s…
Durian smells so strong that hotels and trains ban itThe spiky durian can weigh three kilograms, tastes of custard with savoury undertones and gives off an odour that may linger for days. Some find it sweet, others find it revolting…
During the Cold War, the U.S. Navy attempted to weaponize sharks as living torpedoes.Long before they were pop culture villains, sharks were the subject of a bizarre military initiative called Project Headgear. In the 1960s, researchers attempted to steer sharks u…
During the Cold War, the United States deployed nuclear missiles to defend its own cities.From 1958 to 1979, nuclear-tipped Nike-Hercules missiles stood ready across the United States. Designed to intercept massed Soviet bomber squadrons, these weapons represented a ra…
During the Eocene, a bizarre reptile evolved hooves instead of traditional claws.This video explores the strange evolution of an Eocene-era predator that possessed flesh-tearing teeth and long hind legs, but replaced standard claws with hooves. It examines how…
During the first Moon landing, the computer overloaded, and its design saved the mission.Minutes before Apollo 11 touched down, the Apollo Guidance Computer flashed alarms 1202 and 1201: it had more work than time. Instead of crashing, it restarted, dropped its least …
During the interwar period, the United States secretly planned a full-scale invasion of Canada.This documentary explores War Plan Red, the American military strategy developed after World War I to wage war against the British Empire. It details the planned conquest of Canad…
Durkheim argued every society needs its rule-breakersIt sounds backwards, but the sociologist Émile Durkheim claimed deviance is normal and even necessary. Without vice there is nothing to define virtue against, and without crime no…- Durrës: The ancient Adriatic port that survived empires, earthquakes, and name changes for millennia.Founded as Epidamnos by Greek colonists in 627 BC, this Albanian city has served as a Roman naval base, a Byzantine stronghold, and an Ottoman trade hub. From its massive ancient …
Dušan built a Balkan empire by sieges alone, and it lasted barely 25 yearsIn the 1340s Stefan Dušan doubled the size of Serbia without fighting a single field battle, taking city after city by siege. By 1346 he ruled from the Danube to the Gulf of Corin…
Düsseldorf grew from a Düssel-mouth village after 1288Düsseldorf is capital of North Rhine-Westphalia, Germany’s most populous state, and second only to Cologne inside it. The name joins the little Düssel River to Dorf, “village,” at…- Dust from China's Taklamakan Desert helps seed clouds over the western USWinds carry Taklamakan dust across the Pacific, where its K-feldspar grains are especially good at triggering ice in clouds over the western United States. The desert itself, slig…
Dusty rings around stars reveal the hidden history of planet formationA review of circumstellar debris disks shows that the dust surrounding many stars acts as a cosmic fossil record. Researchers found that while some dust remains from the initial b…