#archivewiki

1976 Tehran UFO incident Source: On 19 September 1976, a radar and visual sighting of an unidentified flying object (UFO) occurred over Tehran, the capital of Iran, by civilians and military personnel.

Navier–Stokes equations Source: The Navier–Stokes equations mathematically express momentum balance for Newtonian fluids and make use of the conservation of mass. They are sometimes accompanied by an equation

Leidos Source: Leidos Holdings, Inc. is an American defense, aviation, information technology, and biomedical research company headquartered in Reston, Virginia, that provides scientific, engineering,

Lorentz force Source: Lorentz force acting on fast-moving charged particles in a bubble chamber. Positive and negative charge trajectories curve in opposite directions. In electromagnetism, the Lorentz

American wire gauge Source: American Wire Gauge (AWG) is a logarithmic stepped standardized wire gauge system used since 1857, predominantly in North America, for the diameters of round, solid, nonferrous,

Business cycle Source: Business cycles are intervals of general expansion followed by recession in economic performance. The changes in economic activity that characterize business cycles have important

Floor and ceiling functions Source: For example, for floor: ⌊2.4⌋ = 2, ⌊−2.4⌋ = −3, and for ceiling: ⌈2.4⌉ = 3, and ⌈−2.4⌉ = −2. The floor of x is also called the integral part, integer part, greatest

Kirlian photography Source: In 1889, Czech Bartoloměj Navrátil [cs] coined the word "electrography". Seven years later in 1896, a French experimenter, Hippolyte Baraduc, created electrographs

Electromotive force Source: For two-terminal devices modeled as a Thévenin equivalent circuit, an equivalent emf can be measured as the open-circuit voltage between the two terminals. This emf can drive

Solar eclipse of August 12, 2026 Source: The total eclipse will pass over the Arctic, Greenland, Iceland, the Atlantic Ocean, northern Spain and the extreme northeastern part of Portugal.[3] The points

Malaysia Airlines Flight 370 Source: The crew of the Boeing 777-200ER, registered as 9M-MRO, last communicated with air traffic control (ATC) around 38 minutes after takeoff when the flight was over the

Galvannealed Source: Galvannealed or galvanneal (galvannealed steel) is the result from the processes of galvanizing followed by annealing of sheet steel. Galvannealed steel is a matte uniform grey color,

Tribute in Light Source: The Tribute's illumination begins at dusk and ends at dawn, with the lights being turned off for 20-minute periods to allow migratory birds to escape as needed. On clear nights,

Andrea Booher Source: Booher photographed numerous disasters for FEMA in addition to the September 11 attacks, including floods in the Midwest, Hurricane Andrew, California earthquakes,[6] the Cerro Grande

Michael Faraday Source: As a chemist, Faraday discovered benzene and tetrachloroethylene, investigated the clathrate hydrate of chlorine, invented an early form of the Bunsen burner and the system of oxidation

Abraham Accords Source: The Abraham Accords are a set of agreements that established diplomatic normalization between Israel and several Arab states, beginning with the United Arab Emirates and Bahrain.[1][2]

Hypnic jerk Source: A hypnic jerk is defined as a brief and sudden involuntary contraction of the muscles of the body which occurs when a person is beginning to fall asleep, often causing the person to

Curl (mathematics) Source: Depiction of a two-dimensional vector field with a uniform curl. In vector calculus, the curl, also known as rotor, is a vector operator that describes the infinitesimal circulation

Faraday's law of induction Source: Motional emf, induced by moving a conductor through a magnetic field.Transformer emf, induced by a changing magnetic field. In electromagnetism, Faraday's law of induction

Tayra Source: The tayra (Eira barbara) is an omnivorous animal from the mustelid family, native to the Americas. It is the only species in the genus Eira. Tayras are also known as the tolomuco or perico