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Neves-Corvo
Neves-Corvo is an underground copper, zinc, lead, and silver mine in the Alentejo district of southern Portugal, operated by Somincor and producing continuously since 1989.
Neves-Corvo Mine
The Neves-Corvo Mine is an underground copper, zinc, lead, tin, and silver mine in the Baixo Alentejo region of southern Portugal, opened in 1988 and operated since 2025 by Boliden.
Nevil Sidgwick
Nevil Vincent Sidgwick (1873–1952) was an English theoretical chemist at Oxford who systematized the dative bond, proposed the effective atomic number rule, and shaped VSEPR theory.
Nevirapine
Nevirapine (NVP), sold as Viramune, is a non-nucleoside reverse transcriptase inhibitor approved in 1996 to treat HIV-1 infection, now limited by liver and skin toxicity.
New England Journal of Medicine
The New England Journal of Medicine (NEJM) is a weekly peer-reviewed medical journal published by the Massachusetts Medical Society. Founded in 1812, it describes itself as the oldest continuously published medical periodical.
New England's Dark Day
New England's Dark Day was an episode of near-total daytime darkness across New England on May 19, 1780, attributed to wildfire smoke combined with fog and cloud cover.
New Foundations
New Foundations, also called typed set theory, is an axiomatic set theory proposed by W. V. Quine in 1937, known for admitting a universal set.
New Frontiers program
The New Frontiers program is a NASA planetary science program of medium-sized, PI-led spacecraft missions, initiated in 2003; its missions include New Horizons, Juno, and OSIRIS-REx.
New General Catalogue
The New General Catalogue (NGC) is a catalog of 7,840 non-stellar astronomical objects, chiefly galaxies, compiled by John Louis Emil Dreyer and published in 1888 by the Royal Astronomical Society.
New inflation
New inflation is a cosmological model proposed in 1982 by Andrei Linde and independently by Albrecht and Steinhardt, in which a slowly rolling scalar field drives accelerated expansion.
New Madrid seismic zone
The New Madrid seismic zone, also called the New Madrid fault, is the most seismically active area in the central and eastern United States, producing the great 1811–1812 earthquakes.
New moon
The new moon is the lunar phase in which the Moon lies in the same direction as the Sun, so it rises and sets with the Sun and is invisible from Earth.
New physics interpretations of ultra-high-energy cosmic rays
Speculative beyond-standard-model explanations of the highest-energy cosmic rays and their flux suppression above 10^19.6 eV, invoking super-heavy dark matter decays, topological defects, or Lorentz-invariance violation.
New production
New production is ocean primary production fueled by nitrogen from outside the sunlit surface layer, chiefly nitrate, and is the fraction exported to the deep ocean.
New tolerance factor to predict the stability of perovskite oxides and halides
The Bartel tolerance factor, τ, is a descriptor introduced in 2019 that predicts whether an ABX₃ compound forms a perovskite from ionic radii alone, with 92% accuracy.
New Year's Day
New Year's Day, observed on January 1, is the first day of the Gregorian calendar year and a public holiday in at least 169 countries worldwide.
New York Hall of Science
The New York Hall of Science, or NYSCI, is a hands-on science museum in Flushing Meadows Corona Park, Queens, New York City, founded as a pavilion for the 1964–1965 World's Fair.
New Zealand Emissions Trading Scheme
The New Zealand Emissions Trading Scheme is a cap-and-trade program, established in 2008, that prices greenhouse gas emissions across most of the New Zealand economy.
New Zealander
New Zealander is the name given here to Ernest Rutherford, the New Zealand-born physicist who won the 1908 Nobel Prize in Chemistry and discovered the atomic nucleus.
NewAthena
NewAthena, short for New Advanced Telescope for High-ENergy Astrophysics, is a planned ESA X-ray observatory carrying the largest X-ray telescope ever built, with launch planned for the late 2030s.
Newcastle-Ottawa Scale
The Newcastle-Ottawa Scale (NOS) judges the quality of non-randomized cohort and case-control studies for systematic reviews and meta-analyses, awarding a star score from 0 to 9.
Newcomb's paradox
Newcomb's paradox, also called Newcomb's problem, is a thought experiment in decision theory, devised in 1960 by physicist William A. Newcomb and published by Robert Nozick in 1969.
Newman projection
The Newman projection is a drawing convention in organic chemistry representing a molecule viewed along the bond between two adjacent atoms, useful for visualizing conformations.
Newman–Kwart rearrangement
The Newman–Kwart rearrangement is a thermal organic reaction, first reported in 1965, that converts O-aryl thiocarbamates into S-aryl thiocarbamates and serves as the key step in converting phenols into thiophenols.
Newman–Penrose formalism
The Newman–Penrose formalism, or NP formalism, is a method in general relativity, introduced by Ezra Newman and Roger Penrose in 1962, that rewrites Einstein's field equations using four null vectors.
Newmark-beta method
The Newmark-beta method, also known as the Newmark method, is a single-step time integration scheme for solving the equations of structural dynamics, introduced by Nathan M. Newmark in 1959.
Newsvendor model
The newsvendor model, also called the newsboy problem, is a single-period inventory model that finds the profit-maximizing order quantity for a product with uncertain demand and no chance to reorder.
Newtok relocation
The Newtok relocation moved the Yup'ik village of Newtok, Alaska, to Mertarvik due to erosion, one of the first climate-change relocations of an Alaska Native community.
Newton
The newton (N) is the SI unit of force, defined as the force that gives a one-kilogram mass an acceleration of one meter per second squared, honoring Isaac Newton.
Newton (unit)
The newton (symbol: N) is the SI unit of force, defined as the force that accelerates a one-kilogram mass by one meter per second squared.