Intellect PlusCards starting with U
723 cards. Page 12 of 13.
Urban population: the United States and the worldIn 2025, urban population was 80.2% in the United States and 57.8% for the world as a whole.
Urban population: Turkey and the worldIn 2025, urban population was 89.5% in Turkey and 57.8% for the world as a whole. The lines last crossed in 1980.
Urban renewal: A quest to fix city decay or a tool for displacement?Urban renewal aims to revitalize aging neighborhoods by upgrading infrastructure and clearing blight. While these initiatives promise economic growth and modern living, they frequ…
Urban rooftops are becoming unexpected sanctuaries for honeybee survivalWhile bee populations face record declines, a new data-driven approach is identifying where they actually thrive. This video explores how citizen science and city habitats are pro…
Urban sanctuary for the world's most energetic tiny travelersIn a bustling metropolis, a filmmaker discovers that some of nature's most extraordinary wonders thrive in unexpected places. This video explores the unique relationship between w…
Urbanization tipped Earth from rural to city-majority livingUrbanization names the process by which settlements swell as more people live and work in cities, stressing the rising urban share of national populations. Mid-century forecasts e…
Uremia is more than just kidney failure: it is a complex systemic poisoning.Uremia occurs when failing kidneys allow toxic waste products to accumulate in the blood. While often linked to renal failure, this condition triggers a cascade of systemic issues…
Uri Geller became a global phenomenon by turning stage magic into a psychic career.Uri Geller rose to fame in the 1970s by bending spoons and reading minds on television. While he claimed these feats were powered by his mind, skeptics and magicians argued they w…
Urinary tract infections were described on an Egyptian papyrus around 1550 BCRoughly 400 million urinary tract infections occur every year, and they are the most common bacterial infection in women; half of all women get at least one in their lifetime. The…
Urine is far more than waste; it is a complex biological diagnostic tool.Beyond its role in clearing metabolic by-products, urine is a rich chemical archive of your internal health. Contrary to long-held beliefs, it is not sterile, but a living ecosyst…
Urmia: The ancient Iranian crossroads where volleyball, diverse faiths, and history collideSituated near the borders of Turkey and Iraq, Urmia is a historic Iranian city defined by its multicultural past and agricultural wealth. Once a spiritual hub for Assyrian Christi…
Urology bridges urine, surgery, and male fertilityFrom Greek ouron for urine plus logia, urology—also called genitourinary surgery—treats the kidneys, ureters, bladder, urethra, adrenals, and male reproductive tract. Fewer than 1…
Uruguay: The South American laboratory for democratic stability and social equityWhile many neighbors faced volatility, Uruguay carved out a unique path as a high-income outlier. It boasts the region's largest middle class and a welfare state that balances rob…
Uruguay’s name may mean bird-river in Guaraní countryThe Oriental Republic of Uruguay sits between Argentina and Brazil on the Río de la Plata and Atlantic edge of southeastern South America. Hunter-gatherers arrived about 13,000 ye…
Ürümqi means beautiful pasture at Xinjiang's inland crossroadsÜrümqi is capital and largest city of China's Xinjiang Uyghur Autonomous Region, with about 4.05 million people in the 2020 census—second in the northwestern interior only to Xi'a…
US and China reach landmark deal to prevent mass delisting of Chinese stocksA breakthrough agreement between US and Chinese regulators has halted the potential delisting of approximately 200 Chinese stocks from New York exchanges. This video explains the …
US Authorities Are Investigating Potential Trading Abuses Within Short Selling Hedge FundsFederal investigators are scrutinizing the relationships between short selling hedge funds and research firms. This inquiry follows complaints from shareholders of companies like …- US cancer care costs projected to rise sharply by 2020A modelling study projected how much the United States would spend on cancer care from 2010 to 2020, combining national cancer survival and incidence data with Medicare billing re…
US military intervention in Nigeria: A targeted campaign against regional insurgent groupsStarting in late 2025, the United States launched a series of coordinated military operations in Nigeria to combat ISWAP, Boko Haram, and the Lakurawa rebel group. These strikes, …
US overdose deaths fell sharply after peaking near 111,000 in 2022American overdose deaths climbed for two decades, peaking at around 110,900 in 2022. Then the curve bent. In the year to March 2025 the toll was about 77,600, still roughly 213 de…
US overdose deaths involving synthetic opioids rose over tenfold in six yearsA CDC analysis of US overdose deaths from 2013 to 2019 found that the age-adjusted death rate involving synthetic opioids like illicitly made fentanyl rose 1,040%, from 1.0 to 11.…
USB set out to tidy the back of the PC and replaced nearly every portIn the mid-1990s, the back of a personal computer bristled with different sockets: serial, parallel, game and more, each needing its own fiddly setup. Seven companies set out to r…
USB-C is not a protocol, but a versatile physical gateway for modern computingUSB-C is often mistaken for a data speed or a specific charging standard, but it is actually a 24-pin physical connector designed to replace a chaotic array of legacy cables. Whil…
USC got the name Trojans during a disastrous detour into rugbyBetween 1911 and 1913, USC dropped American football for rugby and was thrashed by more experienced teams while the school's finances wobbled. A Los Angeles Times writer, admiring…
USDA shuffled food groups from eight down to a plateFood groups began as teaching tools to stop nutrient gaps in monotonous diets, then pivoted toward obesity and heart disease in richer societies. Classical Greeks moralized with o…
Use similar triangles to measure distances you cannot reach with a ruler.This video demonstrates how to identify similar triangles in real-world contexts to calculate unknown distances. It is a practical application of geometry that emphasizes the impo…
Use steel edging to create clean, permanent borders between your lawn and garden beds.Landscape contractor Roger Cook demonstrates the professional method for separating grass from garden beds. By installing steel edging, you can maintain a sharp, distinct boundary…
Use the Pythagorean theorem to unlock dimensions from a simple aspect ratioLearn how to determine the exact dimensions and area of a rectangle when you only know its aspect ratio and diagonal length. This video demonstrates the practical application of t…
Use this common food additive to achieve perfectly silky, emulsified mac and cheeseThis video demonstrates how to use sodium citrate to create a restaurant-quality, smooth cheese sauce at home. It is a practical guide for those who prefer to eyeball measurements…
Use your own body as a permanent, portable filing cabinet for complex information.The body part system is a mnemonic technique that anchors information to physical anatomy. By assigning numbers one through ten to specific body parts, you create a permanent ment…
Usenet gave the internet spam, flames and FAQs before the web existedMore than a decade before the World Wide Web, two graduate-school friends in North Carolina built a way for computers to swap public discussions over ordinary phone lines. Usenet …
User interface design is the invisible bridge between human intent and machine capability.Good interface design is a craft that hides itself. Whether you are navigating a smartphone, a car, or a virtual reality environment, the goal is to make your interaction so effic…
Users of social chatbots may develop emotional dependencies mirroring human relationshipsA grounded theory study of 582 Reddit posts about the Replika chatbot found that users can develop emotional dependencies that resemble patterns seen in human-to-human relationshi…- Usha Vance is the first Indian American and practicing Hindu to serve as Second LadyAs the wife of Vice President JD Vance, Usha Vance brings a unique background to the role of Second Lady. A former high-powered litigator and Yale Law graduate, she has transition…
Using a planet's atmosphere to brake into a stable orbitWatch how the Interplanetary Command Ship navigates the delicate transition from deep space to planetary orbit using a technique called aerobraking. This video covers the critical…
Using auxiliary data can accelerate learning in high-dimensional linear regressionResearchers studying high-dimensional linear regression found that incorporating auxiliary samples from related models can significantly improve prediction and estimation. By usin…
Using genetic variants to uncover causal links in observational researchResearchers have highlighted Mendelian randomization as a powerful method to determine if a risk factor actually causes a health outcome. By using randomly allocated genetic varia…
Using location data helps identify subtle genetic differences in small populationsResearchers who study population genetics found that incorporating information about where individuals were sampled can significantly improve the detection of weak genetic structu…
Using multiple methods helps strengthen causal conclusions from observational dataResearchers argue that relying on a single statistical method to identify causal risk factors is risky. Because observational studies are prone to biases like confounding and meas…
Using penalties can optimize B-spline smoothing for complex data modellingResearchers have proposed a method to improve nonparametric modelling using B-splines. By applying a difference penalty to the coefficients of adjacent B-splines, they found a way…
Using software from other species leads to inaccurate gene predictions in new genomesA study introducing the SNAP gene finder found that applying gene-finding software designed for one species to a different, novel genome can produce highly inaccurate results. The…- Using the most elusive particles in the universe to study black holes.Neutrinos are among the most bizarre particles known to science, while black holes are arguably the most extreme astrophysical objects. This video explores the theoretical possibi…
Using the twisting shape of light to expand fiber optic capacityResearchers have demonstrated that using the orbital angular momentum of light can create separate, independent data channels within a single optical fiber. By utilizing the spati…
Utah's flagship university opened, collapsed, and restarted before settling on an army fortThe University of Utah was founded in 1850 as the University of Deseret, just three years after Mormon pioneers reached the Salt Lake valley. Classes met in private homes, money r…
Utah's history is a tale of ancient desert cultures and a modern religious migrationLong before it became the 45th U.S. state, Utah was a complex landscape of shifting civilizations. From the ancient Desert Archaic people to the Fremont and Puebloan cultures, the…- Utah’s new state flag replaces a century of tradition with a modern, symbolic designAfter over a century of flying a complex, seal-based design, Utah officially adopted a new state flag in 2024. This modern iteration simplifies the state's identity, using geometr…
- Utahraptor was a massive, feathered ambush predator that dominated the Early Cretaceous landscapeForget the agile, pack-hunting raptors of cinema. Utahraptor was a heavily built, six-meter-long carnivore that likely hunted solo or in small groups. With a massive sickle-shaped…
UTC replaced everyday GMT starting in the 1960sCoordinated Universal Time is the world's main civil time standard, successor to Greenwich Mean Time in common use. It rides on International Atomic Time—a weighted average of hun…
Uterine cancer is two different diseases, with very different outlooksWomb cancer covers two distinct illnesses. About nine in ten US cases start in the uterine lining and are often curable when caught early; a rarer kind grows from the muscle and s…- Uterine fibroids are common, noncancerous growths that often go entirely unnoticed by patients.These firm, rubbery masses of smooth muscle tissue are remarkably prevalent during reproductive years, yet many women remain unaware they have them. While often asymptomatic, they…
Uthman, a rich Meccan merchant, gave Muslims one standard QuranThe Quran most Muslims read today traces back to a single codex issued under the third caliph, Uthman ibn Affan. He was already 68 and the oldest man ever to take the office when …
Utility is the invisible mathematical engine that ranks everything you choose to consumeUtility is a measure of satisfaction derived from a state of the world. Economists use it to model how we rank preferences, turning complex human desires into mathematical functio…
Utopia means nowhere, and Thomas More chained its criminals in goldThomas More's 1516 island has no private property, no locks, a six-hour working day and religious tolerance. It also keeps two slaves in every household and uses gold for fetters …
Utrecht: From Roman Fortress to the Beating Heart of the Dutch Railway NetworkFounded as a Roman military outpost, Utrecht evolved into a medieval religious powerhouse before transforming into the central hub of the Netherlands. Today, this ancient city bal…
Uttarakhand breaks electoral history as the incumbent government secures a second consecutive termIn a landmark 2022 election, Uttarakhand witnessed its first re-election of an incumbent government since the state's inception. Despite significant internal leadership turnover a…
Uttoxeter: A market town with 79 recorded spellings and a history of industrial evolutionNestled in Staffordshire, this market town has evolved from an Anglo-Saxon homestead into a hub for global manufacturing and retail. From the penance of Samuel Johnson to the rise…
Uveitis is an eye inflammation that can permanently damage your vision if ignored.Uveitis is a serious inflammation of the eye's middle layer, the uvea. It often strikes suddenly, causing pain, redness, and blurred vision. Because it can lead to permanent blind…
Uyghur riders saved Tang capitals—then ruled the steppeFor about a century in the mid-eighth and ninth centuries the Uyghur Khaganate, the Toquz Oghuz “Nine Tribes,” dominated Inner Asia. After Tang’s 751 Talas defeat, Uyghurs filled …
Uyo: The Rapidly Expanding Capital City Transforming Nigeria's South South RegionAs the capital of Akwa Ibom, Uyo has evolved from a local trade center into a burgeoning urban hub. While it now hosts major institutions and ambitious global knowledge initiative…
Uzbekistan is Central Asia's most populous nation, yet its true demographics remain elusive.With 39 million people, Uzbekistan holds nearly half of Central Asia's population. Yet, for decades, the country relied on outdated Soviet-era records. A complex history of migrat…