The Enhanced Fujita (EF) scale is a classification system used to rate the severity of tornadoes based on the damage they cause to buildings and vegetation. It was introduced in 2007 as an improvement to the original Fujita scale, which was developed by Dr. Tetsuya Theodore Fujita in the 1970s.

A multiple-vortex tornado is a type of tornado that contains smaller rotating columns of air, or vortices, around its main channel of rotation. These vortices can form within the larger tornado and create a complex structure, with multiple areas of intense rotation occurring simultaneously. Multiple-vortex tornadoes can lead to increased damage potential because the smaller vortices may touch down in different locations around the tornado's core, causing destruction over a wider area compared to a single-vortex tornado.

The term "Power Flash" can refer to different things depending on the context: 1. **Technology and Electronics**: In some technical contexts, "Power Flash" might refer to a rapid surge of electrical power, perhaps used in relation to systems that require brief high-power bursts, such as in certain motors or power supplies.

TWISTEX, or the Tactical Weather Instrumentation for Storms and Tornadoes Experiment, is a research project focused on understanding severe weather phenomena, particularly tornadoes. The initiative involves deploying instrumented vehicles and equipment into storm-prone areas to collect data during severe weather events. This real-time data collection helps scientists analyze storms, improve forecasting models, and advance knowledge about the dynamics of tornado formation.

An Extended Finite State Machine (EFSM) is a computational model that extends the capabilities of a traditional finite state machine (FSM). While a traditional FSM consists of a finite number of states and transitions between those states based on input symbols, an EFSM incorporates additional features that provide greater expressive power.

External combustion engines (ECEs) are a type of heat engine in which the combustion of fuel occurs externally to the engine itself. Unlike internal combustion engines, where fuel is burned within the engine cylinder, external combustion engines generate heat through a separate combustion process that heats a working fluid (such as water or air) that then drives the engine's mechanical motion.

Fable II Pub Games is a collection of mini-games that was released in conjunction with the action role-playing game Fable II, developed by Lionhead Studios and published by Microsoft Game Studios. Launched in 2008, Fable II Pub Games allows players to engage in various gambling-style games that take place within the Fable universe.

Fail-safes in nanotechnology refer to mechanisms or strategies designed to prevent or mitigate potential risks associated with the use of nanomaterials or nanodevices. Due to the unique properties of nanomaterials, such as their small size, high reactivity, and the difficulty in predicting their behavior in biological and environmental systems, fail-safes are crucial for ensuring safety and preventing unintended consequences.

"Fallout: An American Nuclear Tragedy" refers to a book by author and historian Michael M. O'Rourke, published in 2021. The narrative explores the themes of nuclear warfare, its impacts on society, and the broader implications of nuclear policy in the U.S. context. The book delves into historical events, public policy, and cultural responses to the threat of nuclear weapons, examining how these factors have shaped American identity and consciousness.

False brinelling is a type of wear damage that occurs in rolling element bearings, typically caused by vibration or oscillation while the bearing is stationary or not rotating. This condition is characterized by the formation of indentations or pits on the raceways and rolling elements of the bearing. False brinelling can happen when a bearing is subjected to cyclical forces or vibrations, which can lead to localized micro-movements at the contact points between the rolling elements and the raceways.

False precision refers to the misleading impression of accuracy that occurs when a measurement or statement is presented with more detail or specificity than is warranted by the actual data. This can happen in various contexts, such as statistics, scientific measurements, or everyday reporting. For example, if a measurement is reported as 12.34567 meters, it may imply a high degree of precision.

Fangataufa is a small coral atoll located in the South Pacific Ocean, part of French Polynesia. It is situated in the Tuamoto Archipelago, which consists of a large number of islands and atolls. Fangataufa is known primarily for its historic significance, particularly as a site of nuclear testing conducted by France in the 1960s. The atoll was used as a testing ground for both atmospheric and underground nuclear tests, which had significant environmental and geopolitical implications.

The Faraday Medal is a prestigious award presented by the Electrochemistry Group of the Royal Society of Chemistry (RSC) in the United Kingdom. It is named in honor of Michael Faraday, a pioneering scientist known for his contributions to electromagnetism and electrochemistry. The medal is awarded annually to recognize outstanding achievements in the field of electrochemistry.

Farcaster is a decentralized social network that aims to provide users with a platform for social interaction while prioritizing user ownership and control over their data. It operates on principles of decentralization and interoperability, allowing users to connect with one another without relying on traditional, centralized social media platforms. Key features of Farcaster include: 1. **Decentralization**: Unlike conventional social media, Farcaster is built on decentralized protocols, meaning there isn't a single company that controls the network.

The Fawbush-Miller Award is an accolade given annually to recognize significant contributions to the field of meteorology, particularly in the areas of severe weather and forecasting. It is named in honor of Dr. W. L. Fawbush and Dr. E.T. Miller, who conducted important research on tornado forecasting. The award is presented by the National Weather Association (NWA) and is intended to celebrate achievements that enhance public awareness and safety related to severe weather phenomena.

A Fermat number is a specific type of integer that can be expressed in the form: \[ F_n = 2^{2^n} + 1 \] where \( n \) is a non-negative integer. Fermat numbers were named after Pierre de Fermat, a French mathematician, who studied these numbers in the 17th century.

Godwin's Law is an internet adage formulated by Mike Godwin in 1990. It states that as an online discussion grows longer, the probability of a comparison involving Nazis or Hitler approaches one. Essentially, it suggests that in any extended debate, especially in political or ideological contexts, someone will eventually make a reference to Adolf Hitler or the Nazis. Godwin initially proposed the law to encourage more civil discourse and to highlight the diminishing quality of arguments when they devolve into such extreme comparisons.

The Fibonacci sequence is a series of numbers where each number is the sum of the two preceding ones, usually starting with 0 and 1. The sequence goes as follows: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ...

Göbel's sequence is an integer sequence defined by a specific recursive relation. It begins with two initial values, often 0 and 1, and subsequent terms are generated based on the values of previous terms in the sequence.

Interventional radiology (IR) is a medical specialty that uses minimally invasive image-guided procedures to diagnose and treat a variety of conditions. It combines advanced imaging techniques—such as X-rays, CT scans, ultrasound, and MRI—with therapeutic interventions. Key aspects of interventional radiology include: 1. **Minimally Invasive Techniques**: IR procedures often involve small incisions or no incisions at all.