CF Fuenlabrada Promesas is a youth football academy associated with CF Fuenlabrada, a professional football club based in Fuenlabrada, a municipality in the Community of Madrid, Spain. The term "Promesas" translates to "promises" in English, indicating that this academy focuses on nurturing young talent and developing players for future professional careers in football.

Aerodynamicists are specialized engineers or scientists who study the behavior of air as it interacts with solid objects, particularly those that are in motion, such as aircraft, automobiles, and even buildings. They apply the principles of fluid dynamics and aerodynamics to analyze and optimize the performance of these objects in terms of lift, drag, stability, and control.

Johannes Stadius, also known as Joannes Stadius, was a 16th-century Flemish astronomer and mathematician, known for his contributions to the field of astronomy during the Renaissance period. He is particularly noted for his work on celestial maps and his efforts to promote the Copernican heliocentric model of the universe. However, specific details about his life and contributions may be less well-documented compared to more famous figures of his time.

George Barker Jeffery was a geologist and an influential figure in the field of geology and mineralogy, particularly in the context of Canadian geology. He is often noted for his contributions to the understanding of Canada's geological framework and the study of mineral deposits. His work has had a lasting impact on the fields of geology and mining in Canada, particularly his research concerning the formation and distribution of various mineral resources.

Demetrios Christodoulou is a prominent Greek-American mathematician known for his work in the field of general relativity and differential geometry. He was born on July 2, 1939, and has made significant contributions to mathematical physics, particularly in the understanding of the Einstein field equations and the stability of solutions to these equations.

Eduard Feireisl is a prominent Czech mathematician known for his work in the field of mathematical analysis, particularly in the area of partial differential equations. He has made significant contributions to the theory of fluid dynamics and the mathematical analysis of physical models. Feireisl is particularly known for his work on weak solutions and regularity properties of solutions to fluid dynamics equations, and his research has implications in both mathematics and theoretical physics.

Hans W. Liepmann was a prominent American aerospace engineer and professor known for his significant contributions to fluid mechanics and aerodynamics. He was born on January 6, 1914, in Berlin, Germany, and later emigrated to the United States, where he had a profound impact on the field of aerospace engineering and education.

George Batchelor may refer to a few notable individuals, but the most prominent one is likely the British fluid dynamicist known for his significant contributions to the field of turbulence and fluid mechanics. Born in 1920 and passing in 2020, he had a long and influential career, including his work at the University of Cambridge. Batchelor made important advancements in the understanding of turbulence, flow dynamics, and mathematical modeling in fluid systems.

Irmgard Flügge-Lotz (1919–2018) was a notable German-American mathematician and engineer, recognized for her contributions to various fields including mathematics, aerodynamics, and control theory. She was known for her pioneering work in the area of differential equations and their applications in engineering, particularly in relation to dynamic systems. After fleeing Nazi Germany, she settled in the United States where she continued her academic career, becoming a prominent figure in engineering and mathematics.

James B. Francis was an American civil engineer notable for his contributions to the field of hydraulics and water resources engineering. He was involved in significant projects related to water supply systems and flood control. His work often focused on the design and management of water flow and storage systems, and he is known for his innovations in hydraulic design. One of his important contributions is the development of the Francis turbine, which is a type of water turbine widely used in hydroelectric power plants.

John Frederick Clarke might refer to a few different individuals, but without more specific context, it's challenging to determine exactly which John Frederick Clarke you are referring to. One notable figure with this name is John Frederick Clarke (1848-1931), who was an English physician and surgeon known for his contributions to medicine and health discussions during his time.

William Rankine (1820–1872) was a Scottish engineer, physicist, and inventor who made significant contributions to the fields of thermodynamics and civil engineering. He is best known for developing the Rankine cycle, a thermodynamic cycle that describes the operation of steam engines and power plants, providing a theoretical framework for understanding their efficiency. Rankine also worked on the concepts of energy and heat transfer, and his research laid foundational principles for modern engineering practices.

Yakov Zeldovich (1914–1987) was a prominent Soviet physicist and one of the founding figures in several fields of theoretical physics, including cosmology, astrophysics, and plasma physics. He made significant contributions to the understanding of various physical phenomena, including: 1. **Cosmology**: Zeldovich is known for his work in the early development of cosmological theories, including the Big Bang model and the concept of cosmic inflation.

Morrough Parker O'Brien, often abbreviated as M.P. O'Brien, was a notable historical figure involved in the political and legal landscape of 19th-century Ireland and England. He was known primarily for his contributions to the field of law and his work as a politician. O'Brien served as a Member of Parliament and was also involved in various legal cases that highlighted issues of justice and civil rights during his time.

Simen Ådnøy Ellingsen could refer to a specific individual, but there is no widely recognized public figure or entity by that name as of my last knowledge update in October 2023. It's possible that he may be a private individual or someone who has gained recognition after that date.

W. H. Besant refers to Sir Walter Besant, an English novelist, historian, and biographer who was active in the late 19th and early 20th centuries. He is well-known for his works of fiction, many of which are set in London and often explore themes related to social issues and the lives of ordinary people. Besant also played a significant role in promoting the study of London’s history and wrote extensively about the city.

"Sunday" is a song by the British rock band Foals, featured on their album *Everything Not Saved Will Be Lost – Part 2*, released in 2019. The song encapsulates themes of love, longing, and the passage of time, characterized by its dynamic instrumentation and emotive lyrics. It showcases Foals' signature sound, blending elements of rock, art rock, and electronic music.

A more concrete and easier to understand version of it is the more photon-specific Poincaré sphere, have a look at that one first.

Proportionality factor in the Planck-Einstein relation between light energy and frequency.

And analogously for matter, appears in the de Broglie relations relating momentum and frequency. Also appears in the Schrödinger equation, basically as a consequence/cause of the de Broglie relations most likely.

Intuitively, the Planck constant determines at what length scale do quantum effects start to show up for a given energy scale. It is because the Plank constant is very small that we don't perceive quantum effects on everyday energy/length/time scales. On the ${\lim }_{h\to 0}$, quantum mechanics disappears entirely.

A very direct way of thinking about it is to think about what would happen in a double-slit experiment. TODO think more clearly what happens there.

Defined exactly in the 2019 redefinition of the SI base units to:

Originally done with (neutral) silver atoms in 1921, but even clearer theoretically was the hydrogen reproduction in 1927 by T. E. Phipps and J. B. Taylor.

The hydrogen experiment was apparently harder to do and the result is less visible, TODO why: physics.stackexchange.com/questions/33021/why-silver-atoms-were-used-in-stern-gerlach-experiment