All articles starting with H
20,046 articles
Hidden Hills, California
Hidden Hills, California: a guard-gated, equestrian city of about 1,900 residents at the western San Fernando Valley's edge, incorporated October 19, 1961 as Los Angeles County's 73rd city, with no commercial services and equestrian zoning on all parcels.
Hidden Level
Hidden Level is a defense-technology startup in Syracuse, New York, founded in 2018 by Jeff Cole and Gary Dominicos, that builds passive radar systems for airspace monitoring and counter-drone operations.
Hidden Love (偷偷藏不住)
Hidden Love (偷偷藏不住) is a 2023 Youku Chinese youth romance drama adapted from Zhu Yi's novel, starring Zhao Lusi and Chen Zheyuan as Sang Zhi and Duan Jiaxu; it set Youku heat records, scored 6.7 on Douban, streamed globally on Netflix, and spawned a 2026 film adaptation.
Hidden Man (邪不压正)
Hidden Man (邪不压正, Xia Yin) is Jiang Wen's 2018 action comedy-drama, the third film of his Republican Era trilogy, adapted from Zhang Beihai's novel, starring Eddie Peng, Liao Fan, Zhou Yun, and Xu Qing, released July 13, 2018, with a Douban score that fell from 8.2 to 7.2.
Hidden Markov model
A hidden Markov model (HMM), also called a hidden Markov chain, is a statistical model for sequential data where hidden states follow a Markov chain and each emits observations.
Hidden Matching Problem
The Hidden Matching Problem is a communication complexity problem in which Alice holds an n-bit string and Bob holds a perfect matching, defined by Bar-Yossef, Jayram, and Kerenidis in 2004 with the first exponential quantum-classical separation.
Hidden node problem
The hidden node problem, also called the hidden terminal problem, is a wireless network failure where two nodes that cannot hear each other collide at a shared receiver.
Hidden order
Hidden order is the unidentified ordered electronic phase in the heavy-fermion compound URu2Si2, which appears below a sharp phase transition at 17.5 K and has resisted explanation since 1985.
Hidden semi-Markov model
A hidden semi-Markov model (HSMM), also called an explicit duration HMM, is a statistical model extending the hidden Markov model by letting hidden states persist for explicitly modeled random durations.
Hidden shift problem
The hidden shift problem is a computational problem where two functions differ by an unknown shift, and the task is to find it, introduced by van Dam, Hallgren, and Ip.
Hidden spin polarization
Hidden spin polarization, introduced in 2014 by Zhang, Liu, Luo, Freeman, and Zunger, is spin polarization of individual crystal sectors that cancels globally in centrosymmetric materials.
Hidden Strike
Hidden Strike (狂怒沙暴), formerly Project X-traction and Ex-Baghdad, is a 2023 Scott Waugh action comedy starring Jackie Chan and John Cena escorting civilians from an attacked Iraqi oil refinery; shot in 2018 for $80 million, it grossed $981,505 and debuted on Netflix July 28, 2023.
Hidden surface removal
Hidden surface removal, also called visible surface determination, is the 3D computer graphics problem of deciding which surfaces are visible from a viewpoint and discarding hidden ones.
Hidden track
A hidden track, also called a secret track, is an unlisted song concealed on an album, first appearing on The Beatles' Abbey Road in 1969.
Hidden Valley
Hidden Valley Raceway, Darwin NT Australia; permanent 2.87 km anti-clockwise road circuit with 1.1 km main straight; drag strip 1985, circuit 1986; Supercars Darwin Triple Crown host since 1998 and Indigenous Round venue since 2022.
Hidden valley (physics)
A hidden valley in physics is a beyond-the-Standard-Model scenario where a hidden sector of particles couples weakly to the Standard Model, proposed by Strassler and Zurek in 2006.
Hidden-subgroup approach to graph isomorphism
The hidden-subgroup approach to graph isomorphism recasts the graph isomorphism problem as a hidden subgroup problem over the symmetric group, solvable in principle on a quantum computer.
Hidden-variable theory
A hidden-variable theory supplements the quantum state with variables that fix each measurement's outcome, beginning with Einstein's 1935 incompleteness argument and realized in Bohm's 1952 theory.
Hiddo J.L. Heerspink
Hiddo J.L. Heerspink, also known as Hiddo Lambers Heerspink, is a Dutch clinical pharmacologist at the University Medical Center Groningen who leads chronic kidney disease drug trials.
Hide (musician)
hide (Hideto Matsumoto, 松本秀人, 1964-1998) was lead guitarist of X Japan and a solo artist behind HIDE YOUR FACE, PSYENCE, and the LEMONed label; distinct from the Chicago duo HIDE.
Hide & Sis (น้องสาวหายนะ)
Hide & Sis (น้องสาวหายนะ), also translated 绝情姐妹, is a 2025 GMMTV/Snap25 Thai mystery-thriller adapted from the novel Phloeng Buppha: 14 episodes on GMM25 and Viu, June 30 to August 12, 2025, about three heiress sisters suspected when their youngest sister Chatfah falls from the family vacation home and her body vanishes.
Hide and Seek (2005 film)
Hide and Seek is a 2005 American psychological horror film starring Robert De Niro and Dakota Fanning as a widowed psychologist and his daughter, whose imaginary friend turns sinister.
Hide and Seek (Imogen Heap song)
Hide and Seek is Imogen Heap's 2005 a cappella song from Speak for Yourself, recorded in minutes on a DigiTech Vocalist Workstation EX harmonizer after a computer crash, popularized by The O.C., sampled in Jason Derulo's Whatcha Say, and RIAA gold certified.
Hide and Seek (Severance)
"Hide and Seek" is the sixth episode of Severance season 1 (Apple TV+, March 18, 2022, 40 minutes), written by Amanda Overton and directed by Aoife McArdle, in which Lumon activates Dylan's innie at home via the Overtime Contingency protocol.
Hide and Seek (숨바꼭질) (2013 film)
Hide and Seek (숨바꼭질) is Huh Jung's 2013 South Korean debut thriller about squatters secretly living in others' homes, marked by doorbell symbols; Son Hyun-joo stars; 5.6 million admissions, Korean Association of Film Critics Best New Director.
Hide N Seek (2024 film)
Hide N Seek (Telugu: హిదె న సీక్) is a 2024 Telugu-language crime thriller directed by Basireddy Rana, starring Viswant Duddumpudi and Shilpa Manjunath, about dark-web video-game-linked murders in Kurnool; released 20 September 2024, 134 minutes, low box office.
Hide your strength, bide your time
Hide your strength, bide your time (taoguang yanghui, 韬光养晦) is Deng Xiaoping's 1989 Chinese foreign-policy guideline of keeping a low profile, later abandoned under Xi Jinping in favor of fenfa youwei, striving for achievement.
Hide-and-seek
Hide-and-seek, a children's pursuit game also called Sardines in one variant, has a seeker count and then find hidden players. Traced to ancient Greek Apodidraskinda and Shakespeare's Hamlet; playable successfully by most 4-year-olds.
HIDEA syndrome
HIDEA syndrome is a rare autosomal recessive neurodevelopmental disorder caused by P4HTM gene variants, first described in 2014 in Finland; fewer than 50 patients worldwide show hypotonia, intellectual disability, and epilepsy.
Hideaki Anno (庵野秀明)
Hideaki Anno (庵野秀明), born 1960 in Ube, Japan, is the Evangelion creator, Khara president, and director of Shin Godzilla, Shin Ultraman, and Shin Kamen Rider.