Intellect PlusCards starting with O
987 cards. Page 9 of 17.
One formula solves every quadratic, and its inside-out twin is called citardauqAny equation with a squared unknown, a plain unknown and a constant can be cracked with a single expression: negative b, plus or minus the square root of b squared minus four a c,…
One fraudulent paper about twelve children dented a vaccine given 575 million timesBy 2012 the MMR jab had been given some 575 million times, and measles deaths had fallen from about 2.6 million a year to 122,000. Then a single 1998 paper, later ruled dishonest …
One frog's tadpole grows to 27 centimetres, then shrinks as it maturesThe paradoxical frog earns its name. Its tadpoles can stretch to 27 centimetres, longer than any other frog larva, yet the adult that emerges measures only a few centimetres from …
One game, two realities: the fractured narrative of a double agentIn 2006, a single title split into two distinct experiences, offering different storylines, plot twists, and level designs. While they shared the same protagonist and voice cast, …
One gene error explains a blood cancer where a warm bath brings itchingIn polycythemia vera the bone marrow overproduces red blood cells, thickening the blood. Nearly every patient, about 98 percent, carries a mutation in a gene called JAK2, which is…
One giant neuron lets a fish flee in millisecondsEvery fish carries two huge Mauthner cells in its brainstem, one per side. A single impulse from one is enough to bend the whole body into a C and fling the fish away from danger …
One gland is ninety-nine percent digestive, one percent hormonalThe pancreas is a mixed gland behind the stomach: about ninety-nine percent exocrine for digestion, one percent endocrine for blood sugar. Pancreatitis often tracks alcohol or gal…
One God in three persons: how Christians built the Trinity from scattered versesNo single Bible verse spells out the Trinity. Early Christians assembled it from the late 2nd century onward, reading hints into Genesis, the Gospels and Paul's letters, and fourt…
One graduate student's punched cards became a database of 390,000 sequencesIn 1964 a graduate student named Neil Sloane began jotting down integer sequences he met in his research, storing them on punched cards. Six decades later the collection, now the …
One green zero versus two: the house edge you chooseRoulette—French for “little wheel”—lets players bet on a number, a cluster, red or black, odd or even, or high or low. A croupier spins the wheel one way and a ball the other unti…
One guava delivers more than twice a day's vitamin CA 100-gram serving of raw guava supplies about 254 percent of the daily value for vitamin C. The fruit has been grown in Peru since at least 2500 BC, its name comes from the Taíno…
One hand plays chords while the other squeezes airThe accordion is a bellows-driven free-reed aerophone that packs melody on the right and ready-made bass chords on the left. Patented in Vienna by Cyrill Demian in 1829 after Berl…
One hectare of rainforest can hold 42,000 insect species and 313 tree speciesTropical rainforests shelter somewhere between 40 and 75 percent of all species on Earth, including two-thirds of flowering plants, on ground whose soils are surprisingly poor. Th…
One horror franchise, five different realitiesThe Halloween film series is not a single linear story. Instead, it exists across five distinct continuities, each with its own rules, timelines, and character fates. Depending on…
One hot oven can wreck the average temperature of a roomMeasure ten objects in a room: nine sit between 20 and 25 degrees Celsius, and one is an oven at 175. The median stays sensibly between 20 and 25, but the mean jumps to somewhere …
One house, three eras, and a descent into the surrealWhat happens when a single location witnesses the passage of time through different eyes? This British stop-motion anthology explores three distinct worlds—from 19th-century pover…
One hull, three identities: the modular future of naval warfareModern navies are moving away from single-purpose ships toward versatile platforms. The Italian Thaon di Revel-class demonstrates this shift, designed to switch roles from sea res…
One human rights treaty became two because nations disagreed on prioritiesThe United Nations originally planned a single binding treaty of human rights. Members split over whether freedoms from state interference or guarantees like food and schooling ma…
One hundred astonishing facts to satisfy your craving for triviaStep into a weekly showcase of unexpected knowledge. This episode of The List Show delivers a rapid-fire collection of one hundred facts spanning history, science, and culture.
One hundred eight minutes made him the first human in orbitYuri Gagarin (9 March 1934–27 March 1968), Soviet pilot-cosmonaut, became the first person in outer space on 12 April 1961. Launched from Baikonur on Vostok 1, he completed one Ea…
One hundred fifty weekly minutes beats a magic pillPublic guidance usually urges about one hundred fifty minutes of moderate activity each week to cut disease risk, yet even tiny doses beat sitting still. Bill Bryson quipped that …
One hundred strange facts that defy explanation and challenge your perception of reality.This video explores a collection of one hundred bizarre and unexpected facts. From historical oddities to scientific curiosities, it highlights the strange side of human culture a…
One hundred strange facts that will make you pause and wonder why.This video presents a collection of 100 unusual facts spanning various subjects. It is designed for those who enjoy trivia and discovering the oddities of our world, offering a ra…
One hundred years ago, a single discovery fundamentally shattered our understanding of physical reality.In 1925, quantum mechanics evolved from a collection of experimental observations into a comprehensive theoretical framework. This video explores the transformative months that re…
One hypergeometric function quietly contains logarithms, arcsines and Bessel functionsMathematicians have published many thousands of identities for the hypergeometric function, yet nobody knows an algorithm that could generate them all, or even a scheme for organi…
One image, two narratives: The enduring mystery of a child's deathA 59-second clip of a boy crying behind a concrete drum became one of the most polarizing pieces of media in modern history. While it served as a powerful symbol for millions, the…
One in five animal species on Earth is a beetleOur world's most varied category of intricate life forms consists of beetles. This video explores the evolutionary success of these insects and examines how one specific group man…
One in five graduates of the West Point Class of 1942 perished in warWhen the United States Military Academy graduated its class of 1942, the students faced an uncertain future. For a staggering portion of these officers, that future would be cut s…
One in five people globally lived with hearing loss in 2019A systematic review of global population surveys found that approximately 1.57 billion people, or about 20.3% of the world's population, were affected by hearing loss in 2019. The…
One in five people lived as a slave during the Roman Empire's peak.This video examines the pervasive nature of slavery in ancient Rome. It traces the institution from its early origins through the Republic and into the Empire, explaining how a sy…
One in four animal species on Earth may be a beetleRoughly 400,000 beetle species are described—about forty percent of all known arthropods and a quarter of animal species. Estimates suggest up to 1.5 million beetle species exist.…
One in three cancer deaths ties to habits we already knowTobacco, alcohol, obesity, scant produce, and inactivity together explain about a third of cancer deaths. Infections add another sixteen to eighteen percent worldwide. In 2019 som…
One Indian royal family ruled for six centuries, split across three capitalsFrom the 6th to the 12th century, the Chalukyas governed huge stretches of southern and central India. They did it as three linked but separate houses, based at Badami, Vengi and …
One Indonesian province still has a hereditary sultan as its governorIndonesian governors are normally elected for five years and limited to two terms. Yogyakarta is different: its governor is the reigning sultan, Hamengkubuwono, and his deputy is …
One infinite sum quietly encodes the pattern of every prime numberAdd one, a half squared, a third squared and so on forever, and you have touched the Riemann zeta function. Euler found it was secretly built from the primes. Riemann then pushed …
One Ipanema song helped a jazz album sweep GrammysAntônio Carlos “Tom” Jobim fused samba with cool jazz and helped invent bossa nova. His “Garota de Ipanema” has been recorded more than 240 times. When it anchored Getz/Gilberto i…
One is the multiplicative identity, not a primeThe number one is the smallest positive integer and the multiplicative identity: anything times one is itself. By modern convention it counts as neither prime nor composite. Every…
One joule is roughly the energy needed to lift an apple a metreA joule sounds abstract, but it is surprisingly everyday: about what it takes to raise a small apple one metre, or to run a one-watt gadget for a second. Your resting body gives o…
One journalist overturned New York's pinball banIn 1976 Roger Sharpe called a shot to a specific lane before city councillors, proving flippers made pinball skill—not chance. Arcade operators have fought that label ever since, …
One Jurassic stage is named for a mythical lover of the dawnMost slices of geological time take their names from towns and quarries, but the last stage of the Jurassic honours Tithonus, the Trojan prince who fell in love with Eos, goddess …
One Kazakh lake is fresh on one side, salty on the otherLake Balkhash covers about 16,400 square kilometres in southeastern Kazakhstan—Asia’s great sickle-shaped endorheic basin and the world’s fifteenth-largest lake. A narrow strait s…
One killer versus four survivors in a deadly hunt for the EntityIn Dead by Daylight, a single player hunts four others to appease a malevolent, spiritual force. To escape, survivors must work together to repair five generators and power the ex…
One king's pilgrimage flooded Cairo with gold and sank its price for yearsIn 1324 Mansa Musa, king of Mali, passed through Cairo on his way to Mecca with a vast caravan and spent or gave away so much gold that its value in Egypt slumped. A historian wri…- One lab freezer can use as much power as a householdAn ultra-cold laboratory freezer held at minus 80 degrees Celsius can consume about 25 kilowatt-hours a day, roughly what a family home uses. Nudging it to minus 70 cuts energy us…
One language branch links Romani in Europe to Sinhala in Sri LankaMore than 300 languages, spoken by around 1.7 billion people, descend from a single ancestor called Proto-Indo-Iranian. Their range is astonishing: Romani in Europe, Ossetian in t…
One language family remapped half of AfricaBetween about 4000 BC and 500 AD, Proto-Bantu speakers left the Cameroon–Nigeria highlands and spread across Central, Eastern, and Southern Africa. Related languages still carpet …
One legendary athlete just entered a historic circle of six-time gold medalistsWhen the final whistle blew in Paris, Diana Taurasi achieved something nearly impossible. By securing gold in the women's basketball tournament, she joined an elite group of athle…
One letter from Bertrand Russell shook Frege's life's work just before publicationGottlob Frege spent decades trying to prove that all of arithmetic could be built from pure logic. In 1903, as the second volume of his masterwork was going to press, Bertrand Rus…- One letter in 1902 wrecked a logician's plan to build arithmetic from logic.Consider the set of all sets that are not members of themselves. Is it a member of itself? If yes, then no; if no, then yes. Bertrand Russell found this contradiction in 1901 and …
One limestone ridge explains where the Great Lakes sitThe layout of the Great Lakes is no accident. A band of hard Niagara dolomite curves from New York through Ontario to Wisconsin, and the lakes fill the softer lowlands worn away o…- One litre of fuel can match a day of many workers' toilA human labourer turns only about 1 to 5.5 percent of the energy in food into useful work. Burn a single litre of fossil fuel in an engine and you get roughly what 50 hands could …
One litre of maple syrup starts as 20 to 50 litres of sapA maple tree gives only about seven percent of its sap in a season, and that sap is mostly water, around two to five percent sugar. Producers boil away the rest until the liquid r…
One London blues band launched Clapton, Beck and Page in five yearsBetween 1963 and 1968 the Yardbirds passed their lead guitar from Eric Clapton to Jeff Beck to Jimmy Page, three players who all later landed in Rolling Stone's top five guitarist…
One lost battle in 176 BC sent the Yuezhi across AsiaThe Yuezhi were herders on the grasslands of what is now Gansu, trading jade and horses for Chinese silk. A crushing defeat by the Xiongnu in 176 BC split them in two and set off …
One lost battle in 711 opened almost all of Visigothic SpainIn 711 a commander named Tariq ibn Ziyad sailed from North Africa to southern Spain. Watchers on shore reportedly mistook his ships for ordinary trading vessels. By July his army …
One Maghrebi’s Rihla out-mileaged Polo and Zheng HeIbn Battuta of Tangier (24 February 1304–1368/69) spent roughly 1325 to 1354 roaming Africa, Asia, and Iberia. Near life’s end he dictated The Rihla—about 117,000 kilometres of tr…
One mammalian messenger RNA gets read into roughly 2,800 proteinsA gene does nothing on its own. Its instructions must be copied into RNA and, for most genes, translated into protein. The copying is surprisingly efficient: in mammals, each mess…
One man holds nearly every record in Argentina's football historyIn the world of international football, some legends leave a mark. Lionel Messi has rewritten the entire script for Argentina. From his debut as a teenager to his record-breaking …
One man or a unit? The mystery of the Kandahar massacreIn the early hours of March 11, 2012, a U.S. soldier murdered 16 Afghan civilians, including nine children. While the U.S. military maintains it was the act of a single rogue sold…
One man spent nearly half a century tracking every primate groupRuss Mittermeier achieved a biological milestone by becoming the first person to observe all 79 major groups of primates in their natural habitats. This video captures his final s…