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Humanoid

A humanoid is a non-human entity, whether real, fictional, or artificial, that exhibits physical form or behavioral characteristics resembling those of a human, such as bipedal posture, opposable thumbs, or anthropomorphic features.^[1] The term "humanoid" originated in English in 1870, formed by combining "human" with the suffix "-oid," denoting resemblance or likeness, and was initially used in scientific and philosophical contexts to describe entities akin to humans in structure or function.^[2] By the early 20th century, it gained prominence in literature and science fiction, often referring to extraterrestrial beings, androids, or mechanical constructs that challenge boundaries between human and non-human.^[3] In mythology and folklore across cultures, humanoid figures have long symbolized the intersection of human and otherworldly traits, including hybrid creatures like the Greek minotaur—a bull-headed man—or the Egyptian sphinx, a lion-bodied entity with a human head, embodying themes of riddle, guardianship, and the divine-human divide.^[4] These archetypal forms influenced later speculative fiction, where humanoids evolved into more complex narratives; for instance, Karel Čapek's 1920 play R.U.R. (Rossum's Universal Robots) popularized artificial human-like workers, coining "robot" from the Czech word for forced labor and foreshadowing ethical debates on machine sentience.^[5] The most prominent modern application of the humanoid concept is in robotics, where humanoid robots are engineered machines with human-inspired anatomy—typically including a torso, head, arms, and legs—to navigate environments and tools designed for people.^[6] Early prototypes trace to Leonardo da Vinci's 1495 sketches of a mechanical knight capable of basic movements, representing one of the first documented attempts at a humanoid automaton.^[7] Significant milestones include Waseda University's WABOT-1 in 1973, the world's first full-scale humanoid robot, and Honda's ASIMO, developed from 1986 prototypes and publicly unveiled in 2000 as a versatile walking and interacting robot.^[8]^[9] By 2025, advancements in artificial intelligence, sensors, and actuators have accelerated humanoid development, with applications in manufacturing, healthcare, and disaster response; for example, China's Ministry of Industry and Information Technology aims for a robust innovation system by year's end, while global market projections estimate growth to $35 billion by 2035, fueled by companies like Tesla and Unitree deploying models for collaborative tasks.^[10]^[11] Despite progress, challenges persist in achieving fluid motion, energy efficiency, and safe human interaction, as highlighted in ongoing research emphasizing embodied AI over rapid but limited virtual learning.^[12]

Definition and Terminology

Definition

A humanoid is defined as a non-human entity—whether biological, artificial, or fictional—that exhibits a form or characteristics resembling those of a human being, particularly in physical structure and posture. This encompasses creatures or machines that approximate the human body's configuration to facilitate interaction with human environments or narratives.^[1]^[13] Key characteristics of a humanoid include a bipedal structure enabling upright walking, bilateral symmetry, a distinct head housing sensory organs such as eyes, ears, and a mouth, and manipulative limbs typically featuring opposable thumbs for grasping. These traits often extend to facial features capable of expressive gestures and overall body proportions that mimic those of Homo sapiens, such as a torso with attached arms and legs. Such features allow humanoids to perform actions analogous to human locomotion and manipulation, distinguishing them from non-primate or asymmetrical forms.^[14]^[15] The term "humanoid" is broader than related concepts like "android," which specifically denotes an artificial entity, often a robot, engineered to closely imitate human appearance, including lifelike synthetic skin and behaviors, whereas humanoids may lack such realism and apply to diverse non-artificial contexts. This distinction highlights "humanoid" as a general descriptor for human-like morphology across biology, technology, and imagination, without implying mechanical origins. The scope includes extraterrestrial aliens in speculative scenarios, robotic constructs designed for human-centric tasks, and mythical beings with anthropomorphic traits, but excludes entities that are predominantly animalistic or non-figurative in form.^[16]^[17]

Etymology and Historical Usage

The term "humanoid" derives from the English word "human," rooted in Latin hūmānus ("of or belonging to man"), combined with the suffix "-oid," from Greek -oeidēs ("resembling" or "having the form of"). This construction entered English in the late 19th century to denote something resembling a human in form or characteristics.^[3] The Oxford English Dictionary records its earliest attestation in 1870, in the philosophical and spiritualist writings of American author Andrew Jackson Davis, where it described ethereal or otherworldly entities akin to human shape. As an adjective, it initially appeared in anthropological discussions around 1871 to characterize non-human forms with human-like traits, though its usage remained sporadic in scientific literature during the 19th century.^[3] By the early 20th century, "humanoid" began shifting from esoteric and preliminary scientific contexts toward broader cultural applications, particularly in paleontology and speculative fiction. In paleontological discourse, the term occasionally described fossil specimens exhibiting human-like skeletal morphology, such as early hominid remains, though it was not as formalized as emerging terms like "hominid" (from Latin homō, "man," + "-id," denoting family, coined around 1880). The noun form, denoting a being resembling a human, first appeared in print in 1925, coinciding with growing interest in evolutionary biology and human origins.^[3] This period marked a transition, influenced indirectly by early 20th-century works like Karel Čapek's 1920 play R.U.R. (Rossum's Universal Robots), which popularized artificial human-like entities, though Čapek used "robot" rather than "humanoid." The term's adoption accelerated post-1920s as discussions of human evolution and mechanical mimics proliferated in academic and popular media. In the mid-20th century, "humanoid" entered science fiction and ufology, evolving into a staple for depicting non-human intelligences. Its first documented use in science fiction occurs in Isaac Asimov's 1940 short story "Homo Sol," where it refers to alien beings with human-like bodily forms.^[18] By the 1950s, amid the UFO phenomenon, the term described reported extraterrestrial entities in contactee accounts, such as the "Nordic" humanoids—tall, fair-skinned figures—witnessed by figures like George Adamski in 1952, blending speculative lore with emerging extraterrestrial hypotheses.^[19] This cultural expansion contrasted with biological terminology: "hominoid," introduced in 1927 for the superfamily Hominoidea (great apes and humans), derives from Latin homō + "-oid" and specifically denotes primate relations, distinguishing it from the more versatile "humanoid" applied to mimics across fiction, robotics, and anomaly reports.^[20]

Biological and Evolutionary Contexts

Convergent Evolution

Convergent evolution refers to the independent development of similar traits in distantly related species, driven by comparable environmental pressures rather than shared ancestry.^[21] This process occurs when organisms face analogous selective forces, such as the need for efficient locomotion or sensory adaptations, leading to analogous structures that enhance survival in specific niches.^[22] For instance, streamlined body shapes have evolved separately in sharks (cartilaginous fish), dolphins (mammals), and ichthyosaurs (extinct marine reptiles) to optimize aquatic movement, demonstrating how hydrodynamic demands can produce superficially similar forms across lineages.^[23] Similarly, powered flight has arisen convergently in birds, bats (mammals), and pterosaurs (reptiles), where lightweight skeletons and wing structures enable aerial adaptation despite differing evolutionary origins.^[23] In the context of humanoid forms, convergent evolution suggests that traits like bipedalism and manipulative appendages could emerge independently in unrelated species under pressures favoring tool use, upright posture for navigation, or enhanced environmental interaction.^[24] Bipedalism, for example, has evolved convergently in various terrestrial animals, such as kangaroos and certain rodents like jerboas, often linked to energy-efficient locomotion in open or arid habitats, though full humanoid integration with dexterous hands remains rare on Earth.^[25] Key evolutionary pressures for intelligence, a hallmark of humanoid morphology, include the demands of complex social environments or resource exploitation, which favor larger brains and precise manual dexterity; these qualitative forces operate within adaptive landscapes where species converge on viable phenotypic solutions to occupy similar ecological niches.^[26] The relevance of convergent evolution extends to hypothetical extraterrestrial life, where Darwinian principles might predict the emergence of bipedal, intelligent forms with manipulative structures if planetary conditions mirror Earth's in promoting cognitive and technological advancement.^[27] Paleontologist Simon Conway Morris, in his 2003 book Life's Solution: Inevitable Humans in a Lonely Universe, argues that evolution's predictability—evidenced by repeated convergences in sensory systems, locomotion, and cognition—implies that intelligent life elsewhere could resemble humans in fundamental ways, such as bilateral symmetry and encephalization, due to the constrained pathways of adaptive evolution.^[26] This perspective challenges notions of boundless evolutionary novelty, emphasizing instead niche convergence where intelligence requires convergent solutions like forward-facing eyes for depth perception and opposable digits for manipulation.^[28]

Hominid Fossils and Anthropoid Primates

The family Hominidae, commonly known as great apes, encompasses modern humans (Homo sapiens) along with extinct relatives and includes genera such as Australopithecus and Homo, representing key stages in humanoid evolution.^[29] Hominins, a tribe within Hominidae, comprise the bipedal species on the human lineage diverging from the last common ancestor with chimpanzees around 6-7 million years ago, with extinct genera like Australopithecus exhibiting early humanoid traits such as upright posture.^[30] Australopithecus afarensis, dated to approximately 3.9-2.9 million years ago, provides critical evidence of early bipedalism in humanoid ancestors, as seen in the famous "Lucy" specimen (AL 288-1), an adult female skeleton discovered in 1974 at Hadar, Ethiopia, and estimated at 3.2 million years old.^[31] Lucy's partial skeleton reveals a mix of arboreal and terrestrial adaptations, including a human-like pelvis and femur indicating efficient bipedal locomotion, though with longer arms and curved phalanges suggesting some tree-climbing ability.^[32] This fossil highlights anatomical similarities to modern humans, such as a foramen magnum positioned forward for upright head carriage, underscoring the transition toward fully humanoid posture.^[33] Homo habilis, an early member of the genus Homo living from about 2.3 to 1.4 million years ago in East Africa, marks a significant advancement in humanoid evolution through evidence of tool use and increased cranial capacity.^[34] Fossils like OH 7 from Olduvai Gorge show a brain size averaging 600-700 cubic centimeters—larger than Australopithecus but smaller than later Homo species—along with reduced facial prognathism and limb proportions approaching modern human ratios, facilitating dexterous manipulation.^[30] Associated Oldowan stone tools, including choppers and flakes, indicate purposeful modification for cutting and scraping, linking anatomical changes like an opposable thumb to behavioral innovations in early humanoids.^[35] Homo neanderthalensis, or Neanderthals, existed from roughly 400,000 to 40,000 years ago across Europe and western Asia, representing a robust branch of humanoid evolution with pronounced anatomical parallels to modern humans.^[36] Their cranial capacity averaged 1,200-1,750 cubic centimeters, exceeding that of contemporary Homo sapiens, with a long, low skull, prominent brow ridges, and a large nasal cavity adapted to cold climates.^[37] Neanderthals exhibited stocky builds with shorter limb ratios relative to body size—such as upper arm bones about 20% shorter than in modern humans—enhancing heat retention and strength for hunting in Ice Age environments, while their broad ribcages and pelvis supported powerful torsos akin to athletic human proportions.^[38] Anthropoid primates, particularly the great apes (family Hominidae excluding humans), serve as the closest living relatives to Homo sapiens, sharing over 98% of DNA and key humanoid traits that illuminate evolutionary continuity.^[39] Chimpanzees (Pan troglodytes), diverging from the human line approximately 6-7 million years ago, and gorillas (Gorilla spp.), diverging approximately 8-10 million years ago, possess opposable thumbs and large toes enabling precise grasping, much like early hominins, alongside advanced social intelligence evidenced by complex group dynamics, tool improvisation, and communication through gestures and vocalizations.^[40] However, unlike bipedal humanoids, great apes are primarily quadrupedal or knuckle-walkers, with foramen magnum positioned posteriorly and elongated forelimbs suited for brachiation, highlighting bipedalism as a defining divergence in humanoid anatomy.^[41] These fossils and primate studies have profoundly shaped paleoanthropology, providing empirical data on humanoid evolution from arboreal ancestors to upright tool-users, with discoveries like those by the Leakey family in the 1950s-1970s at Olduvai Gorge and Lake Turkana establishing timelines and contexts for genera such as Australopithecus and Homo.^[42] Louis Leakey's 1959 find of Paranthropus boisei and Mary Leakey's 1978 Laetoli footprints (dated to 3.6 million years ago) demonstrated habitual bipedalism, while Richard Leakey's 1970s Turkana expeditions unearthed Homo habilis and Homo erectus specimens, refining understandings of cranial expansion and migration patterns in humanoid development.^[43] Such contributions underscore how fossil evidence informs genetic and behavioral models of human origins, emphasizing anatomical milestones like increased brain size and bipedal efficiency.^[44]

Mythological and Folkloric Representations

In Ancient Mythology

In ancient Greek and Roman mythologies, humanoid figures such as centaurs and satyrs embodied the fusion of human and animal traits, often symbolizing the conflict between civilization and primal instincts. Centaurs, depicted as having the upper body of a human and the lower body of a horse, were frequently portrayed as wild and unruly beings who disrupted human society, as seen in myths like the Centauromachy, where they clashed with the Lapiths during a wedding feast, representing the triumph of order over chaos.^[45] Satyrs, hybrid creatures with human torsos and goat-like legs and horns, served as companions to the god Dionysus, participating in ecstatic rites that celebrated wine, fertility, and unrestrained revelry, thereby illustrating themes of boundary-crossing between the divine and mortal realms.^[46] Mesopotamian and Egyptian mythologies featured humanoid heroes and guardians that blurred lines between humanity, divinity, and the animal world, often serving protective or cautionary roles in epic narratives. In the Mesopotamian Epic of Gilgamesh, dating to around 2100–1200 BCE, the titular hero is described as two-thirds divine and one-third human, a semi-divine king whose quests for immortality highlight themes of hubris and the limits of human ambition, transforming him from a tyrannical ruler to a wiser figure through encounters with wild nature and the gods.^[47] The Egyptian sphinx, a monumental hybrid with a human head—typically royal—and a lion's body, functioned as a guardian of sacred spaces like temples and tombs, embodying the pharaoh's protective power and the integration of human intellect with leonine strength to ward off chaos.^[48] Across other ancient cultures, such as Norse and Hindu traditions, stunted or nature-attuned humanoids reinforced motifs of divinity and transgression within cosmological frameworks. In Norse mythology, dwarves (dvergar) appeared as short, sturdy humanoids skilled in craftsmanship, forging divine artifacts like Thor's hammer Mjölnir while dwelling in subterranean realms, symbolizing the earth's hidden generative forces and the boundaries between mortal ingenuity and godly intervention. Trolls, often depicted as grotesque, oversized or stunted human-like beings, lurked in remote landscapes, embodying chaotic forces that challenged human settlements and divine order.^[49] In Hindu mythology, yakshas were benevolent nature spirits assuming human-like forms, associated with wealth, forests, and water, acting as guardians under the deity Kubera and illustrating the interplay of fertility, mischief, and spiritual guardianship in Vedic and post-Vedic lore.^[50] These humanoid representations originated in oral traditions around 2000 BCE, evolving from shared Indo-European and Near Eastern storytelling practices that explored human-divine boundaries, as evidenced by archaeological finds like Mesopotamian reliefs from the third millennium BCE depicting hybrid figures in ritual contexts, such as bull-men and winged composites on cylinder seals and palace walls, which underscore their role in symbolizing cosmic protection and royal authority.^[51] Common themes of hubris—seen in Gilgamesh's defiance of mortality—and boundary-crossing, as in centaurs' dual nature, reflected societal anxieties about the fragile divide between order and wilderness in pre-modern cosmologies.^[52]

Mythic Humanoid Creatures

In European folklore, elves and fairies are often depicted as diminutive humanoid beings with supernatural abilities, residing in natural settings like forests and meadows, where they engage in mischievous or benevolent interactions with humans. These creatures, sometimes winged or ethereal, were believed to possess magical powers such as shape-shifting or enchanting music, serving as guardians of nature or tricksters who could lead travelers astray.^[53]^[54] Werewolves, another prominent example, represent shapeshifting human-animal hybrids that transform under the full moon, embodying primal fears of uncontrolled savagery and the blurred boundary between human and beast in rural communities.^[55]^[56] Bigfoot, also known as Sasquatch, emerges as a towering, hairy cryptid humanoid in North American indigenous and settler folklore, lurking in remote wilderness areas and occasionally leaving massive footprints as signs of its elusive presence.^[57]^[58] Across Asian traditions, the Japanese yokai known as kappa illustrates aquatic humanoid creatures with scaly skin, webbed hands, and a dish-like depression on their heads that holds water essential to their strength. These beings inhabit rivers and ponds, pulling unwary humans underwater or challenging them to sumo wrestling, often as a cautionary figure against venturing too near water hazards.^[59]^[60] In African folklore, particularly among Zulu and Xhosa communities, the tokoloshe appears as a mischievous, dwarf-like humanoid summoned by sorcerers, standing about one meter tall with a volatile temperament that allows it to cause harm or play pranks on villagers.^[61]^[62] These mythic humanoid creatures share common traits, including supernatural powers like invisibility or superhuman strength, a preference for habitats in untamed wilderness or hidden waters, and interactions with humans that range from deceptive tricks to protective warnings against moral lapses.^[53]^[55] Such lore evolved from ancient oral storytelling traditions passed down in rural communities, later documented in 19th-century collections like those by the Brothers Grimm, who transcribed tales from informants to preserve fading vernacular narratives amid industrialization.^[63]^[64] Culturally, these creatures functioned to impart moral lessons, such as the perils of greed or disrespect for nature, while explaining unexplained phenomena like disappearances in the woods or sudden misfortunes as interventions from the supernatural realm.^[65]^[53] Through such stories, communities reinforced social norms and environmental awareness without relying on formal religious doctrines.

Representations in Fiction and Pseudoscience

In Science Fiction

Humanoid figures have appeared in science fiction since the late 19th century, often serving as vehicles to explore human nature, evolution, and ethical boundaries. In H.G. Wells' 1896 novel The Island of Doctor Moreau, a shipwrecked narrator encounters beast-men—surgically altered hybrids of animals and humans—created by the titular scientist on a remote island, raising profound questions about the limits of scientific intervention and the essence of humanity.^[66] This work established early tropes of artificial humanoids as both pitiable and monstrous, reflecting contemporary anxieties over Darwinian evolution and vivisection debates.^[67] By the mid-20th century, science fiction shifted toward synthetic humanoids indistinguishable from humans, amplifying themes of identity and empathy. Philip K. Dick's 1968 novel Do Androids Dream of Electric Sheep? centers on androids—bioengineered replicas used for off-world labor—who escape to Earth and challenge bounty hunter Rick Deckard's perceptions of what constitutes a living being, particularly through tests of emotional response.^[68] The story critiques societal devaluation of artificial life, foreshadowing debates on artificial intelligence rights.^[69] In cinema, humanoid aliens and synthetics became central to visual storytelling, emphasizing otherness while maintaining relatability. The Star Trek franchise, beginning with its 1966 television series, featured humanoid extraterrestrials like the warlike Klingons and logic-driven Vulcans, who share bipedal forms and bilateral symmetry with humans, facilitating explorations of diplomacy, culture clash, and universal ethics across diverse planetary societies.^[70] Ridley Scott's 1982 film Blade Runner, adapted from Dick's novel, depicts replicants—nexus-6 models engineered for superhuman strength yet limited lifespans—as fugitive entities pleading for extended existence, embodying tensions between creator and creation, human prejudice, and the blurred line between organic and artificial sentience.^[69] Depictions evolved from the grotesque, tentacled "bug-eyed monsters" in 1930s pulp magazines like Astounding Stories, which portrayed aliens as invasive threats to human dominance, to sophisticated cyberpunk narratives post-2000 that humanize synthetics amid dystopian tech integration.^[71] This progression incorporated concepts like the uncanny valley, where humanoid designs too closely mimicking yet deviating from human features provoke discomfort, influencing character aesthetics in media.^[72] Recent works, such as Denis Villeneuve's Dune adaptations (2021 and 2024), present the Fremen—desert-adapted humans on Arrakis—as resilient humanoid archetypes navigating ecological and imperial conflicts, echoing ancestral survival themes.^[73] These portrayals have profoundly influenced cultural views on technology and extraterrestrial encounters, fostering empathy for the "other" while amplifying fears of dehumanization. Science fiction's humanoid motifs, from Wells to contemporary films, mirror societal shifts toward AI integration and space exploration, shaping public discourse on ethics and coexistence as evidenced in analyses of genre impacts.^[74]^[75]

In Ufology

In ufology, humanoid entities are frequently described in reports of extraterrestrial encounters, often portrayed as visitors from other planets or dimensions who interact with humans through sightings, abductions, or communications. These accounts emerged prominently in the mid-20th century, coinciding with the rise of modern UFO investigations, and typically feature beings with bipedal forms, varying in size and appearance but sharing anthropomorphic traits like limbs, heads, and facial features. Proponents argue these humanoids represent advanced extraterrestrial civilizations, while skeptics attribute the reports to misperceptions, hoaxes, or psychological phenomena. One of the foundational events in ufology's humanoid lore is the 1947 Roswell incident in New Mexico, where debris from a crashed object was initially reported by the U.S. military as a "flying disc" before being retracted as a weather balloon. Ufologists later claimed the site yielded bodies of grey aliens—small, slender humanoids with large heads, grey skin, and oversized black eyes—allegedly recovered and covered up by the government. This narrative gained traction in the 1970s through books and testimonies, establishing the "grey" archetype as central to abduction claims. Similarly, in the 1950s, contactee George Adamski reported meetings with Venusian humanoids, described as tall, fair-skinned beings with human-like features who communicated telepathically about interstellar peace; his 1952 encounter in the California desert, detailed in photographs and writings, influenced early contactee movements.^[19] Common humanoid types in ufology include the greys, depicted as 3-4 feet tall with frail builds, minimal facial features, and a clinical demeanor during alleged medical examinations; they are linked to abduction scenarios involving genetic experimentation. Nordics, in contrast, are portrayed as tall (6-7 feet), blonde, blue-eyed beings resembling idealized Scandinavians, often benevolent and warning of environmental perils in contactee accounts from the 1950s onward. Reptilians, popularized in the 1990s by David Icke's theories, are said to be shapeshifting, lizard-like humanoids infiltrating human society as world leaders, driven by malevolent agendas of control. These archetypes recur across thousands of global reports compiled by organizations like MUFON.^[76]^[77] Key events reinforcing humanoid extraterrestrial claims include the 1961 abduction of Betty and Barney Hill, an interracial couple who described being taken aboard a craft by short, grey-skinned humanoids; under hypnosis, Betty recalled a star map shown by the beings, later interpreted by ufologists as depicting the Zeta Reticuli system. In the 2020s, U.S. congressional hearings on unidentified anomalous phenomena (UAP) brought renewed attention, with whistleblower David Grusch testifying in 2023 that the government recovered "non-human biologics" from crash sites, echoing Roswell-era assertions. Subsequent hearings in 2024 and 2025, including sessions on November 13, 2024, and November 19, 2025, continued to explore UAP recovery programs and non-human biologics, with a 2025 congressional briefing reportedly discussing encounters with species resembling greys, nordics, and others, further fueling ufological narratives as of November 2025.^[78]^[79]^[80]^[81]^[82] Pseudoscientific theories like Erich von Däniken's 1968 ancient astronauts hypothesis propose that humanoid visitors influenced early human civilizations, interpreting ancient art and texts as evidence of extraterrestrial intervention in evolution and architecture.^[83] Despite these narratives, ufology's humanoid claims face substantial criticisms for lacking empirical evidence, with no verifiable physical artifacts or peer-reviewed data supporting extraterrestrial origins. Many abduction reports align with sleep paralysis episodes, a common sleep disorder involving hallucinations of shadowy figures, immobility, and pressure on the chest, which can produce vivid, fear-inducing visions mistaken for real encounters; studies of self-reported abductees often reveal correlations with this condition rather than external events. Psychological factors, including suggestibility and cultural influences from media, further explain the persistence of these accounts without invoking aliens.^[84]^[85]

Technological and Modern Applications

In Robotics

Humanoid robots in robotics are engineered machines designed to mimic human form and movement, enabling them to interact with environments built for people. These robots typically feature bipedal locomotion to navigate stairs, doors, and uneven terrain, with structures incorporating 30 or more degrees of freedom (DoF) across limbs, torso, and head to replicate human-like dexterity and flexibility.^[86] For instance, modern designs often include 34 DoF, as seen in robots like the HRP-4, allowing for precise manipulation and posture adjustments.^[86] Balance is maintained through integrated sensors such as gyroscopes for orientation detection and AI-driven vision systems using cameras to process spatial data in real time.^[87] The historical development of humanoid robots began with the WABOT-1, completed in 1973 at Waseda University in Japan as the world's first full-scale anthropomorphic robot.^[8] This pioneering machine integrated a limb-control system, vision capabilities for reading musical scores, and auditory processing to communicate in Japanese and measure distances.^[8] Advancements accelerated in the late 1990s with Honda's ASIMO, unveiled in 2000, which demonstrated stable bipedal walking at speeds up to 1.6 km/h and object recognition through its lightweight 43 kg frame and 26 DoF; subsequent versions improved these specifications, reaching 57 DoF by 2011.^[88] Boston Dynamics' Atlas, introduced in 2013 under DARPA funding, marked a shift toward dynamic mobility, showcasing feats like parkour and object manipulation with its hydraulic actuators and 28 DoF, evolving into fully electric versions by 2024 for enhanced agility.^[89] Technical aspects of humanoid robots center on sophisticated control systems, including inverse kinematics algorithms that compute joint angles to achieve desired end-effector positions for tasks like grasping or gesturing.^[90] These are often augmented by AI integration, where machine learning models process sensor data to enable adaptive behaviors, such as recognizing and replicating human gestures via frameworks like MediaPipe for real-time hand tracking.^[91] Hardware specifications typically include high-torque servo motors for joints, lithium-ion batteries for power, and onboard processors like NVIDIA Jetson for AI computations, though energy demands limit operation to 2-4 hours per charge.^[92] Contemporary examples highlight practical applications and ongoing innovations as of 2025. Tesla's Optimus, announced in 2021 and reaching prototype stages by 2022, features a 1.73 m tall frame with 28 DoF, AI vision for navigation, and as of 2025, Tesla has initiated limited production with plans for thousands of units in low-labor tasks like factory assembly.^[93]^[94] SoftBank's Pepper, launched in 2014, emphasizes social interaction with an "emotional engine" using cloud-based AI to detect facial expressions and tones via multimodal sensors, standing at 1.2 m with 20 DoF for customer service roles.^[95] Engineered Arts' Ameca, debuted in 2021, prioritizes expressive communication with over 50 lifelike facial expressions driven by 32 facial actuators, serving as an AI development platform for human-robot interaction.^[96] Persistent challenges include improving energy efficiency through lighter materials and optimized actuators, as well as enhancing stability during dynamic movements to prevent falls in unstructured environments.^[92]

Ethical and Societal Implications

The development of humanoid robots raises profound ethical dilemmas, particularly concerning human perception and emotional responses to near-human forms. The uncanny valley effect, first described by Japanese roboticist Masahiro Mori in 1970, posits that as robots become increasingly lifelike but not perfectly human, they evoke feelings of discomfort, eeriness, or revulsion in observers due to subtle imperfections in appearance or movement.^[97] This phenomenon has been empirically supported in subsequent studies on human-robot interaction, influencing design choices to avoid overly realistic features in order to maintain user comfort.^[98] Another key ethical concern involves the potential personhood of advanced AI humanoids, exemplified by the humanoid robot Sophia, which was granted citizenship by Saudi Arabia in 2017, marking the first instance of a robot receiving legal recognition as a non-human entity with rights.^[99] This event sparked global debates on whether sufficiently sophisticated humanoids could warrant moral or legal status, challenging traditional notions of agency and consciousness.^[100] Societal impacts of humanoid integration include significant risks of job displacement, especially in labor-intensive sectors like manufacturing, as these systems handle repetitive tasks with greater efficiency and lower error rates.^[101] In military applications, humanoid robots are increasingly deployed for reconnaissance and hazardous operations, functioning as ground-based drones to reduce human casualties, with companies seeking contracts from the U.S. Department of Defense for defensive roles as of 2025.^[102] Such uses raise concerns about escalating conflicts through autonomous warfare and the ethical boundaries of delegating lethal decisions to machines.^[103] Legal frameworks for humanoids draw from both fictional precedents and emerging regulations. Isaac Asimov's Three Laws of Robotics, introduced in his 1942 short story "Runaround," have profoundly influenced real-world discussions by establishing hierarchical principles: robots must not harm humans, must obey orders, and must protect their own existence unless conflicting with the first two laws.^[104] The European Union's AI Act, enacted in 2024, classifies certain high-risk AI systems—including those in robotics that could impact safety or rights—as requiring rigorous conformity assessments, transparency, and human oversight to mitigate harms from humanoid deployments.^[105] Post-2020 advancements in AI have intensified debates on robot rights, with scholars arguing for extended legal protections if humanoids demonstrate emergent sentience, while others contend that such status undermines human-centric ethics.^[106] Humanoid robots also prompt cultural shifts that challenge human identity and perpetuate biases. By mimicking human forms and behaviors, these robots blur distinctions between artificial and organic entities, potentially eroding perceptions of uniqueness in human cognition and social roles, as explored in analyses of AI's societal integration.^[107] Gender biases are evident in designs, where many 2025-era humanoid assistants are female-coded to embody subservient traits, reinforcing stereotypes of women in supportive positions and commodifying intimacy through gendered interactions.^[108] This trend, rooted in training data from human societies, risks normalizing inequalities unless addressed through diverse design practices.^[109]

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(of a machine or creature) with the appearance and qualities of a human: He had built the machine to appear humanoid. They are developing humanoid robots.
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UFOs: Why Humanoid Aliens? Why So Varied? | Skeptical Inquirer
In the early days of UFOlogy, that of the 1940s, 1950s, and some decades later, the extraterrestrial hypothesis was the preferred explanation. But it never ...
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Convergent Evolution - an overview | ScienceDirect Topics
Convergent evolution is defined as the process whereby distantly related organisms independently evolve similar traits to adapt to similar necessities.
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Convergent evolution explained with 13 examples
Thirteen interesting examples of convergent evolution · 1. Swimming shape: Sharks, dolphins and ichthyosaurs · 2. Camera-type eyes: Mammals, octopuses and squids.
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The evolution of bipedalism in jerboas (rodentia: Dipodoidea)
Our results suggest that bipedalism evolved as an adaptation to humid woodlands or forests for vertical jumping. Running at high speeds is likely a by-product ...
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Why do mammals hop? Understanding the ecology, biomechanics ...
Jun 15, 2018 · We conclude that the most likely reason that bipedal hopping evolved is associated with predator avoidance by relatively small species in forested environments.
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Life's Solution - Cambridge University Press & Assessment
'Simon Conway Morris's bold new book, Life's Solution, challenges this Darwinian orthodoxy by extending ideas he presented in his Crucible of Creation …
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Feb 13, 2011 · It is a neo-Darwinian orthodoxy that evolution lacks predictability; imagining what extra-terrestrial life would look like in any detail is a futile exercise.
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Conway Morris: Extraterrestrials: Aliens like us?
The clue lies in the phenomenon known as evolutionary convergence (Conway Morris 1: CouLd this CarboniferousfossiL be an aLien goLdfish? tSimon Conway ...
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Hominin Taxonomy and Phylogeny: What's In A Name? - Nature
Thus, the Family Hominidae is a taxon, as is the species H. sapiens and the Order Primates. The plural is taxa. Taxonomic rank: This refers to different ...Hominin Taxonomy And... · Australopithecus And The... · Neanderthals And The Problem...
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Hominins are all species, including side-branches and extinct species, on the human line (highlighted) after our Last Common Ancestor with chimpanzees & bonobos ...
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Jan 3, 2024 · 'Lucy' (AL 288-1) is an adult female, 3.2 million-year-old A. afarensis skeleton found at Hadar, Ethiopia. Because she could walk upright on the ...
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About the Fossil Lucy | Institute of Human Origins
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Biology 2e, Biological Diversity, Vertebrates, The Evolution of Primates
A number of marker features differentiate humans from the other hominoids, including bipedalism or upright posture, increase in the size of the brain, and a ...
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Until recently, humans were separated from the other great apes at the “family” level. All great apes are too closely related to be separated into different ...
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[PDF] Hominid Evolution - Yale-New Haven Teachers Institute
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[PDF] TOLKIEN: MONSTERS, MIDGARD, AND MEDIEVAL ORIGINS
mythic dwarf onto his new form of troll. 7 However, trolls, like dwarves, are an ill- defined creature in mythic texts. The word trolls "though often used ...
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The Folklore of Faeries, Elves & Little People A Study in a Cultural ...
Faeries, trolls, goblins--are these simply creatures of age old ... dwarves and Trolls rather than the more refined ―Faery‖ terminology used elsewhere.
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[PDF] A Natural History Of Fairies
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This essay will explore early-modern European werewolf legends and cases to find out how werewolves reflected anxieties about the boundaries between humans and ...
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Tracking the Legend of Bigfoot | Arizona State Museum
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The Implications of Bigfoot Preservation Laws in Washington State
The first Sasquatch, or Bigfoot, story was published by pioneer missionary Elkanah Walker in 1840 and a long tradition of publishing Bigfoot stories has ...
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Kappa - Yōkai Senjafuda - Mellon Projects - University of Oregon
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“I will not Lie to You. The Tokoloshe Exists”: Mythical Creatures and ...
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"i will not lie to you. the tokoloshe exists": mythical creatures and ...
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How the Grimm Brothers Saved the Fairy Tale
The stories the Brothers Grimm first collected are brusque, blunt, absurd, comical, and tragic, and are not, strictly speaking, “fairy tales.”
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The Brothers Grimm Did Much More Than Tell Fairy Tales
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In stock Free delivery over $20A masterpiece ahead of its time, a prescient rendering of a dark future, and the inspiration for the blockbuster film Blade Runner.
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Star Trek's Crazy (& Brilliant) Reason Why Aliens Look Human
Jul 16, 2019 · There are in-fiction and real-world reasons for why Star Trek's cavalcade of forehead prosthetic-enhanced alien species look so human.
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The Aliens in Us and the Aliens Out There: Science Fiction in ... - NIH
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Human Culture and Science Fiction: A Review of the Literature ...
This article aimed to uncover the foci, themes, and findings of research literature that utilized science fiction content or concepts to describe and ...
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The Roswell Incident: Did The US Cover Up An Alien UFO Crash In ...
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Alien Abduction in the White Mountains
Learn about Betty and Barney Hill's experience with alien abduction and the events that occurred in the White Mountains in 1961.
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In this article, we summarize two studies. In the first study, we assessed 10 individuals who reported abduction by space aliens and whose claims were linked ...
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[PDF] An overview of humanoid robots technologies - LAAS
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Implementation of singularity-free inverse kinematics for humanoid ...
This study presents the efficacy of deep learning techniques in controlling the arm of a humanoid robot without resorting to inverse kinematic analysis.
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Human–Robot Interaction Using Dynamic Hand Gesture for ... - MDPI
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SoftBank Mobile and Aldebaran Unveil “Pepper” – the World's First ...
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Ameca - World's Most Advanced Humanoid Robot | Engineered Arts
Emphasize an Idea, Express an Emotion. Ameca comes pre-programmed with over 50 realistic facial expressions, conveying a wide range of natural human emotions.
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The Uncanny Valley: The Original Essay by Masahiro Mori-IEEE ...
This is the first publication of an English translation that has been authorized and reviewed by Mori and explored its implications for human-robot ...
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Everything You Need To Know About Sophia, The World's First ...
Nov 7, 2017 · Sophia, a delicate looking woman with doe-brown eyes and long fluttery eyelashes made international headlines. She'd just become a full citizen of Saudi Arabia.
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How will Artificial Intelligence Affect Jobs 2025-2030
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AI-powered soldiers: Are humanoid robots the future of warfare?
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[PDF] Metis Study No. 43 | July 2025 | Humanoid robots
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Mar 31, 2025 · This blog will explore both sides of the debate regarding such developments, explore the legal perspective on a global level, and examine the alternative ...
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The evolving identity of AI robots and their place in human society
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Feminised by Design: Rethinking Gender-Bias in AI Companions
Sep 29, 2025 · Feminised by design, AI companions commodify intimacy and risk hardwiring gendered stereotypes into our digital lives.
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Nov 23, 2020 · Some AI robots or digital assistants clearly assume a traditional “male” or “female” gender identity. Harmony, a sex robot who can quote ...<|separator|>