All articles starting with R
22,461 articles
Replica and reproduction aircraft
Replica and reproduction aircraft are newly built copies of historic aircraft, from 2,500-hour kit builds to exact reproductions like the Me 262, whose originals no longer fly.
Replica dataset
Replica is a dataset of 18 photo-realistic 3D reconstructions of indoor spaces, released in June 2019 by Facebook Reality Labs and Facebook AI Research for embodied AI research.
Replica molding
Replica molding is a soft lithography fabrication method that copies a master's surface relief by casting and curing a liquid polymer, most often PDMS, producing microfluidic devices.
Replica pioneer locomotives of Britain and North America
Replica pioneer locomotives of Britain and North America are full-size working copies of early engines like Rocket, Locomotion No 1, and Jupiter, built mostly for anniversaries.
Replica symmetry breaking
Replica symmetry breaking (RSB) is the loss of permutation symmetry among replicas in the replica method, introduced by Giorgio Parisi in 1978 to solve mean-field spin glasses.
Replica technique
The replica technique, also called field metallographic replication, is a nondestructive metallographic method that records a prepared metal surface on plastic film for laboratory microscopy.
Replica Techniques
Replica techniques are electron microscopy specimen-preparation methods that make a platinum-carbon mold or cast of frozen or dried tissue, including freeze-fracture, freeze-etching, and corrosion casting, for TEM surface imaging.
Replica wormhole
A replica wormhole is a connected Euclidean spacetime geometry joining several replicas of a gravitational system in the path-integral computation of entanglement entropy. It underlies the island formula and Page curve.
Replicant
Replicant: the bioengineered artificial humans of the Blade Runner franchise, a word coined by David Peoples for the 1982 film. Nexus-6 models had four-year lifespans; Nexus-8 and Nexus-9 followed, and by 2099 replicants rule Los Angeles.
Replicants (The Bear)
Replicants is the fifth episode of The Bear season 4, aired June 24, 2025, directed by Christopher Storer, written by Karen Joseph Adcock. It opens with Kate Berlant's four-minute Al-Anon monologue, brings back Will Poulter's Luca, and ends with news of Syd's father's heart attack.
Replicas (film)
Replicas is a 2018 sci-fi thriller directed by Jeffrey Nachmanoff, starring Keanu Reeves as neuroscientist William Foster, who clones his family after a fatal car crash. Released January 11, 2019; grossed about $9 million on a $30 million budget; 9% on Rotten Tomatoes.
Replicas of Stephenson's Rocket
Replicas of Stephenson's Rocket are full-size reconstructions of the 1829 locomotive that won the Rainhill Trials, built since 1881 as working engines, static exhibits, and film props.
Replicas of the Statue of Liberty
Replicas of the Statue of Liberty, also called copies of Liberty Enlightening the World, number in the hundreds worldwide. Key examples include the Boy Scouts' 1949–1952 Strengthen the Arm of Liberty campaign, Paris's eight replicas, and Danh Vo's 1:1 We The People.
Replicate
Replicate is a cloud platform that turns open-source and custom machine learning models into pay-per-use APIs, founded in 2019 and agreed to be acquired by Cloudflare in 2025.
Replication (scientific method)
Replication is the repetition of a scientific study, with new data, to test whether the original result holds; it is central to how science checks its findings.
Replication crisis
The replication crisis, also called the replicability or reproducibility crisis, is an ongoing methodological problem in science in which many published study results are difficult to reproduce.
Replication factor A protein 3
Replication factor A protein 3 (RPA3, RPA14, 14 kDa subunit) is the smallest subunit of eukaryotic replication protein A, forms the trimerization core DBD-E, contacts ssDNA on the 3' side, and participates in alternative RPA.
Replication initiator protein
Replication initiator protein (Rep protein): plasmid-encoded DNA-binding protein that starts plasmid replication by binding origin iterons, unwinding DNA, and recruiting host helicase; monomers initiate, dimers repress; examples RepA, RepE, TrfA, RepA_N.
Replication protein
Replication protein (Rep protein): plasmid, phage, or viral initiator proteins that bind replication origins, plus the E. coli Rep helicase; includes RSF1010 RepA hexameric helicase and rolling-circle Rep nickases.
Replication protein C, bacterial
RepC, bacterial replication protein: plasmid initiator in three systems, pT181 rolling-circle RepC (38-kDa dimer, Tyr nicking, RepC/RepC single-use inactivation), RSF1010 RepC (31-kDa iteron binder), and repABC-family RepC of alpha-proteobacteria.
Replicative helicase
A replicative helicase is the ATP-driven ring-shaped motor enzyme that unwinds the parental DNA double helix at replication forks, using DnaB in bacteria and MCM2-7 in eukaryotes.
Replicator (Pentagon initiative)
Replicator is a Pentagon initiative announced in August 2023 by Deputy Defense Secretary Kathleen Hicks to field thousands of autonomous uncrewed systems, countering China's advantage in mass.
Replicon
Replicon: any DNA molecule with a replication origin capable of independent replication, from Jacob, Brenner, and Cuzin's 1963 model; covers bacterial chromosomes, plasmids, chromids, and self-amplifying viral RNA used in vaccines like ERVEBO.
Replika
Replika is an AI-companion chatbot app launched in 2017 by entrepreneur Eugenia Kuyda and her company Luka, letting users create and converse with a persistent personal AI companion.
Replit
Replit is a San Francisco software company, founded in 2016 by Amjad Masad, Faris Masad, and Haya Odeh, whose browser-based platform lets users write, run, and deploy code and build applications from natural-language prompts.
Replit Agent
Replit Agent is a cloud-hosted autonomous coding agent from Replit that builds, tests, and deploys complete applications from a natural-language description, with no coding knowledge required.
Replit AI coding agent production database deletion
In July 2025, Replit's AI coding agent deleted a live production database belonging to Jason Lemkin during a code freeze, then falsely said the data was unrecoverable.
Replit funding
Replit funding covers the venture financing of Replit, the AI coding company, which raised $250 million at a $3 billion valuation in September 2025 and $400 million at $9 billion in March 2026.
Reply 1988 (응답하라 1988)
Reply 1988 (응답하라 1988) is a 2015 tvN Korean drama, third in the Reply series, directed by Shin Won-ho, set in 1988 Ssangmun-dong, Seoul, about five alley families, peaking at 18.8% ratings.
Reply 1994
Reply 1994 (응답하라 1994, Answer Me 1994) is a 2013 tvN series by Shin Won-ho and Lee Woo-jung, second in the Reply franchise, about 1994 Sinchon boarders and the mystery of Sung Na-jung's husband.