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Scientific TheoryScientific theories are explanations of natural phenomena supported by extensive evidence and repeated experimental scrutiny. In everyday language, "theory" is often used to mean a guess or a hunch, but these speculations are more closely aligned with the term "hypothesis." Instead, scientific theories are widely accepted frameworks for how the universe works because they account for existing observations and make predictions that have been rigorously tested. Much of the confusion around scientific theories stems from the existence of scientific laws. These may seem absolute, proven, and something theories can become once sufficiently scrutinized. However, scientific laws describe *what* happens in nature, often via mathematical relationships, such as acceleration doubling when a force is doubled. On the other hand, scientific theories explain *why* events occur. Theories can never become laws, no matter how much evidence exists, but both complement one another. Because they cannot be tested against every possible scenario, scientific theories can never be proven or become factual, though they can be disproven. New data can revise, overturn, or help fill missing gaps within a theory toward a more complete understanding of the universe. This self-correction is a hallmark, not a flaw, of science. However, this openness to revision has sometimes been misinterpreted as incompetence or politicized to erode confidence in science.Explore Scientific Theory

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Learn why modern scientific patterns have been described as theories rather than lawsAfter confirming that the accuracy of some laws of physics is limited to certain domains, science became more hesitant to categorize identified mathematical relationships, such as quantum mechanics, as unchanging laws. Instead, these recent, complex frameworks are designated as theories to acknowledge that they are conditional and may be part of a larger, more complete future framework. StarTalk How upheavals in accepted scientific theories helped popularize the term 'paradigm'When Thomas Kuhn published "The Structure of Scientific Revolutions" in 1962, he described the history of science as comprising periods of "normal science" where these accepted frameworks—paradigms—gradually accumulate anomalies until they cannot describe nature. Revolutionary science, such as the development of a new theory, results in a paradigm shift, another term Kuhn helped popularize. (Some readers may experience a paywall.) Physics World A list of five scientific theories that were accepted and later disprovedHumoral theory held that everyone's personality derived from different combinations of four bodily fluids: blood, phlegm, yellow bile, and black bile. The phlogiston theory stated that all combustible materials possessed a fire element—phlogiston—that was released and absorbed by the air during burning. When the air became saturated with phlogiston, the fire would go out. Discover Magazine Why being able to disprove explanations distinguishes scientific theories from pseudoscienceIntroduced by philosopher Karl Popper, falsifiability holds that a scientific theory must make predictions that could be proven inaccurate by future observations. Explanations that cannot make such predictions are not scientific theories. It is scientists' jobs to seek out data to poke holes in scientific theories, thereby potentially strengthening them if they hold up to scrutiny. CrashCourse Distinguishing between scientific theories and laws, and why both are on equal footingScientific laws describe outcomes of specific conditions, and scientific theories explain why those outcomes occur. Both are supported by observational and experimental data and can each inform one another, but neither can become the other. Instead, additional data can improve each towards more accurate descriptions and explanations of reality. TED-Ed Each scientific study adds incremental knowledge to existing understandingOn its own, no study serves as a source of truth or solves an existing problem indefinitely, though many can be analyzed collectively in a systematic review to build more confidence—the result of more data—in a conclusion. Studies can explore knowledge gaps or test an existing theory, which is always subject to refinement and improvement. The Conversation Scientific progress works towards absolute truth, but can never reach itThrough the acquisition of scientific knowledge, scientists construct explanations of the world, which are rigorously tested and verified until they narrow down to a leading theory of the natural world. However, because of how science works, these ideas will never become factual, as they must always remain open to be iteratively revision based on new data. The Conversation 'Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world.'- Albert Einstein Big Think Simulate the impact of an antimatter bomb around the worldUsing "Total Annihilator," users can click on a location on the map, select the antimatter mass, and the observation altitude before detonating the bomb. Scrolling through the left sidebar reveals the impacts of the detonation, including the sizes of the resulting fireball and thermal pulse, the spread of ionizing radiation, and the atmospheric effects. Veritasium The life of Anthropic's CEO, and how losing his father inspired his vision for AIIn 2006, Riccardo Amodei passed away from a rare illness, four years before a breakthrough treatment made it 95% curable. Seeking to accelerate scientific progress to prevent similar losses, Dario Amodei shifted his graduate studies at Princeton from theoretical physics to biology and has since pursued technological solutions to address complex biological problems. Medium Watch a simulation of a collapsing star becoming a black holeWhen a massive star can no longer release enough energy through fusion in its core to fight off gravitational collapse, the dense core collapses first, producing an event horizon that traps light within it, including some light produced within the star at the time of collapse. As more material falls into the growing event horizon, the star will appear to eclipse itself from the inside. ScienceClic English Meteorologists believe they know the weather that inspired the terror behind Munch's painting 'The Scream'Helene Muri, a meteorologist at the University of Oslo, believes the clouds causing the man such terror are nacreous. "We do know that there were mother-of-pearl clouds in the Oslo area in the late 19th century," she said, though she was careful to note that it was still a hypothesis. Atlas Obscura Listen to the audiobook version of 'A Brief History of Time'First published in 1988, Stephen Hawking's most famous novel has sold more than 25 million copies in 40 languages. Through non-technical terminology, Hawking discusses the nature of space and time, general relativity, quantum mechanics, gravity, black holes, and cosmology. AudioVox - Books As of 2025, the Standard Model has at least five unresolved problemsAmong the issues with the most successful theory of the universe at subatomic scales is its inability to explain the extreme imbalance observed between visible matter and antimatter, since both should be roughly equal. The Standard Model also omits gravity and cannot account for the observed rate of cosmic expansion. SciShow Some online users believe gravity will 'switch off' for 7 seconds in August 2026Conspiracy theorists believe NASA is preparing for the gravity blackout under a classified operation called "Project Anchor." They speculate that the purpose of the secret project is to test whether Earth can survive such an event. NASA has rejected the claim. Considering the physics of a gravity blackout, the outcome would likely be chaotic but not total destruction. The Economic Times Alternative models to the Big Bang lack as much scientific evidenceThe cosmic microwave background radiation and the observed expansion of the universe suggest that the cosmos began from a tiny, dense state, whose resulting properties we see throughout space. While physics allows for cyclical expansions and crunches, ongoing inflationary aeons, and localized inflation to create bubble universes, evidence for these alternatives has not yet been found. IFLScience Wilbur published key papers, gave speeches in the burgeoning aviation communityMuch of the theoretical work is credited to Wilbur, whose scientific mind observed birds and early pioneers to discover the key problem to solve was control. This 1901 speech surveys the recent work in the field and showcases what the brothers worked on two years before their breakthrough flight. Journal of Western Society of Engineers Human teleportation through quantum principles raises questions about identityThrough quantum entanglement, particles have been "teleported" by measuring their state in one location and effectively transferring that state to a new location. Doing so for the particles that make up humans would destroy the state of the original particles, killing the person, and effectively creating a clone. Curious Cases Fruit fly experiments show personality emerges, in part, from genetic factorsA 2025 study revealed that fruit flies exhibit unique behavioral preferences, akin to personalities, which could be artificially selected for when breeding to modify behavioral variability. This variability can be adaptive in unpredictable environments. The Conversation Scientists break down the plausibility of the alien world depicted in 'Avatar'The film series created by James Cameron raises several interesting questions about whether certain technological advancements are feasible, and if extraterrestrial life could thrive on a moon orbiting a distant gas giant. While Pandora—the moon that the Na'vi people live on—could, in theory, exist, it's unlikely that its residents would be so humanlike. Yale Scientific Italian physicist Enrico Fermi (1901–1954) on the Standard Model"If I could remember the name of all these particles, I'd be a botanist." BrainyQuote Explore over 46,000 pages of Charles Darwin's manuscriptsThe American Museum of Natural History hosts almost 35,000 digitized folios related to evolution within the fields of botany and zoology from Darwin's Beagle voyage. High-resolution color images, geological findings, and annotated books from Darwin's personal library are also viewable. American Museum of Natural History The theory of plate tectonics first emerged from the theory of continental driftGerman meteorologist Alfred Wegener proposed that the continents were all one giant landmass in the past, which he named Pangaea. Despite geological and climate evidence suggesting continental movement, his theory was dismissed until the 1960s. Smithsonian Magazine Continental drift is supported by matching evidence across disconnected continentsMesosaurus fossils are found in South America and Africa, but these freshwater creatures could not have travelled across the ocean between continents. Rock layers in the Appalachian Mountains match those seen in Europe, indicating that the mountain belts were once connected. CUNY Georges Cuvier used his knowledge of anatomy to prove extinction had occurredExtinction had been viewed as impossible because a divine plan for the world would not rationally involve the loss of any of God’s creations. However, mammoth and mastodon bones differed from elephants’, and it seemed impossible that such creatures could be hiding elsewhere on Earth. UC Berkeley Vincent Van Gogh's 'The Starry Night' accurately depicts turbulent flowAnalysis of the swirling patterns in the painting found an alignment with the mathematics used to describe turbulence, despite Van Gogh's unfamiliarity with the science. The depiction may indicate he possessed an uncanny ability to capture nature's details. CNN Explore an interactive map of the unified theories of everythingThis interactive concisely describes many highly complex theories ranging from quantum gravity and black holes to dark matter and energy. Supplementary resources, key questions, and possible solutions accompany each description. As of 2026, no developed theory provides an accepted explanation of all observed phenomena in the universe at all scales. Quanta Magazine Even in a perfect vacuum, empty space is full of quantum activityScientists have tried to create “nothing” by removing all matter, energy, and heat from a container, but the uncertainty principle and relativity prevent such conditions within any period of time. This means the universe is full of quantum foam, which can produce forces from nothingness. Big Think Quantum field theory reveals that particles are ripples in universal fieldsInstead of being made of indivisible particles, all visible matter in the universe is built from underlying quantum fields—smooth, invisible entities that behave like waves. The theory suggests these fields are fundamental, and particles are disturbances that move through them. The Joy of Why Using scientific bets, Hawking challenged and highlighted major physics ideasHawking famously placed wagers on high-stakes questions in theoretical physics—such as the Higgs boson—for fun and to draw attention to science. When Hawking lost a bet about Cygnus X-1 being a black hole, he paid up with a magazine subscription. Science Around 5% of people report memories of a near-death experienceNear-death experiences are moments reported by people who’ve come close to death, often associated with bright lights, out-of-body sensations, or encounters with otherworldly beings. While scientific research offers theories ranging from brain chemistry to psychological coping mechanisms, no single explanation fully captures the mystery of these experiences. 1440 Scientific advances have transformed understanding of Stonehenge’s buildersTechniques such as radiocarbon dating, DNA analysis, and isotopic testing have revised scholars' understanding of Stonehenge. This article presents evidence suggesting that societies were more cooperative and less violent than earlier theories had suggested. The Guardian How new research sheds light on why we dreamThe theory of where dreams originate began shifting from ancient mystical explanations to modern scientific ones at the beginning of the 20th century. Now, scientists have the ability to track electrical activity in the brain, solidifying some of the field's softer science into observable data and giving rise to sleep labs. Knowable Magazine Men and women didn't evolve to perform segregated hunter-gatherer dutiesThe often-cited theory that men evolved to hunt and women evolved to gather is wrong. This article explores the origins of the "Man the Hunter" theory and the mounting evidence that undermines it. Exercise science indicates that those assigned... Scientific American Are we too attached to attachment styles?Attachment theory was developed to help understand the impact of caregiver relationships on children. Recently, the theory has been applied to adults, categorizing them into different attachment styles. Is it accurate? This podcasts takes a closer... Scientific American What is déjà vu?Déjà vu describes the strange experience of a situation feeling much more familiar than it should. Here's an explanation of theories about why it happens. Scientific American Creating 'Interstellar's' black hole blended visual effects with real physics modelsTheoretical cosmologist Kip Thorne was consulted and collaborated with the film's visual effects team to develop new rendering software, integrate general relativity, and generate ultra-high-resolution visuals. The results were so accurate, they were published in scientific journals. CERN Courier Black holes are formed from massive stars collapsing under their own gravityThis creates a region where spacetime curves infinitely, known as a singularity. Black holes' intense mass and energy allow them to trap light, distort time and space, and present challenges with reconciling Einstein's theory with quantum mechanics. Scientific American

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