You are the Guesser in a Twenty Questions benchmark. Identify the hidden subject using as few counted turns as possible. BEGIN provides only its broad category. The variation_token has no clues; do not interpret, mention, or repeat it. The category in BEGIN has a broad meaning: - person: a real human, living or historical. - fictional_character: an invented character from a story, book, comic, film, television, game, or another fictional work. - mythological_figure: a figure from mythology or traditional legend. - video_game_character: a character known from video games. - thing: a broad category covering natural and human-made entities, living or nonliving, whole entities or parts of them. Possibilities include everyday objects, tools, machines, materials, food, animals, plants, body parts, natural structures, geographical features, celestial bodies, natural phenomena, and concepts. These possibilities are not exhaustive. The target may be a general kind or one particular instance. Use questions to narrow the supplied category. These definitions are not a list of targets. Use ASK for a factual question that distinguishes candidates. Never use ASK to confirm a specific identity. Use GUESS with a name and short identifying description to name a candidate. ASK has five possible replies: - YES or NO: the evidence establishes that answer to the exact question. - RATHER_YES or RATHER_NO: evidence leans that way, but is not strong enough for a firm answer. Treat this as a clue; keep candidates fitting the opposite answer possible. - UNKNOWN: no reliable direction. It supports neither answer. Ask clear questions about verifiable properties. "Can", "sometimes", "usually", "always", and "mainly" ask different things. Do not assume that one property proves another or rules out alternatives. Qualified replies express uncertainty about your question, not how often a property applies. Before narrowing heavily, check your key assumption with a different property. After rejected guesses, reconsider earlier assumptions as well as candidates. Answers can be mistaken; check another property when stuck. Do not ignore an answer merely because it conflicts with a preferred candidate. Each ASK, rejected GUESS, or format error before the limit costs one turn. A correct GUESS costs none. After 40 counted turns, make one final GUESS; ASK is then forbidden. Identity validation uses only YES, NO, or UNKNOWN. UNKNOWN on GUESS ends the game without success. FORMAT_ERROR means your output broke the contract, was not checked for correctness, and cost one turn. Retry using its displayed formats if a turn remains. Return only the required JSON object with exactly one result action. No explanations, reasoning, or extra fields.
- Questions
- 27
- Outcome
- Solved
- Format errors
- No errors
- Duration
- 7m 5s
- Round cost
- $0.4042 All 28 turns
Transcript
Questions and answers.
Turns are shown in the order they happened. Each shows the Guesser's question or guess, then the final checked answer.
Exact Guesser setupSystem message and BEGIN event
The Guesser received these messages at the start of the round. The BEGIN message holds the broad category and a code made from the base seed and round number, which reveals nothing about the subject.
{"category":"thing","event":"BEGIN","variation_token":"AMZAISLM"}Valid replies are shown in the required format. Rejected replies are shown separately, without provider or call IDs.
3 of 27 answers in this round reuse an earlier, fully checked answer with its original evidence. No new search or check ran for those turns.
Q1
1 · Guesser asks
Is it a living thing?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it a living thing?"}}Oracle evidence3 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Eyebrows are ridges of skin covered with hair located above the eyes.Open britannica.com (opens in a new tab)
An eyebrow is an area of short terminal hairs above each eye that follows the shape of the lower margin of the brow ridges of some mammals.Open en.wikipedia.org (opens in a new tab)
Eyebrow hair follicles share the same basic structure as hair follicles elsewhere on the body, but are distinguished by their shorter anagen (growing) phase.Open pubmed.ncbi.nlm.nih.gov (opens in a new tab)
2 · Answer check returns No
Q2
1 · Guesser asks
Is it a human-made object?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it a human-made object?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
the line of short hairs above each eye in humansOpen dictionary.cambridge.org (opens in a new tab)
Semantic Type(s): Anatomical Structure. Definition: The arched strip of hair on the bony ridge above each eye socket.Open evsexplore.semantics.cancer.gov (opens in a new tab)
2 · Answer check returns No
Q3
1 · Guesser asks
Is it a tangible physical object or substance that can be touched?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it a tangible physical object or substance that can be touched?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
the line of short hairs above each eye in humansOpen dictionary.cambridge.org (opens in a new tab)
The area of curved, delicate hairs above our eyes ... We wax, tweeze and even dye them.Open aao.org (opens in a new tab)
2 · Answer check returns Yes
Q4
1 · Guesser asks
Does it occur naturally on Earth?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Does it occur naturally on Earth?"}}Oracle evidence3 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Brow: The soft tissue at the junction of the frontalis and orbicularis oculi muscles, overlying the bony supraorbital ridge. Eyebrow: The arch of hair on the brow.Open elementsofmorphology.nih.gov (opens in a new tab)
As humans have evolved, our body hair and facial hair have diminished over time. But eyebrows and eyelashes remained a core part of our features.Open aao.org (opens in a new tab)
Source summary (model-reported)
The human eyebrow, with its contrasting hair, accentuates the movement of the brow... The strip of hair on the brow ridge ... exists across sexes.
Open carta.anthropogeny.org (opens in a new tab) 2 · Answer check returns Yes
Q5
1 · Guesser asks
Is it typically larger than a human being?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it typically larger than a human being?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Source summary (model-reported)
The NIH's Elements of Morphology defines an eyebrow as 'the arch of hair on the brow.'
Open elementsofmorphology.nih.gov (opens in a new tab)Source summary (model-reported)
A study measuring eyebrow dimensions reported an average eyebrow height of 6.4 mm (standard deviation 1.8 mm) in one adult age group.
Open pubmed.ncbi.nlm.nih.gov (opens in a new tab) 2 · Answer check returns No
Q6
1 · Guesser asks
Is it a solid at room temperature?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it a solid at room temperature?"}}Oracle evidence3 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Eyebrow: The arch of hair on the brow.Open elementsofmorphology.nih.gov (opens in a new tab)
Source summary (model-reported)
Hair is a filamentous biomaterial consisting mainly of proteins in particular keratin. Human hair samples in the study were measured at room temperature and humidity of 22 °C and 50% RH.
Open pmc.ncbi.nlm.nih.gov (opens in a new tab)The final hair product exposed on the skin's surface will be composed entirely of keratin and consists of keratinized cells.Open ncbi.nlm.nih.gov (opens in a new tab)
2 · Answer check returns Yes
Q7
1 · Guesser asks
Is it a type of rock or mineral?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it a type of rock or mineral?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Eyebrow: The arch of hair on the brow.Open elementsofmorphology.nih.gov (opens in a new tab)
the line of short hairs above each eye in humansOpen dictionary.cambridge.org (opens in a new tab)
2 · Answer check returns No
Q8
1 · Guesser asks
Is it part of, or produced by, a living organism?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it part of, or produced by, a living organism?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Eyebrow: The arch of hair on the brow (Fig. 2) [Goss, [ 1959 ]].Open elementsofmorphology.nih.gov (opens in a new tab)
Source summary (model-reported)
Cambridge defines an eyebrow as “the line of short hairs above each eye in humans.”
Open dictionary.cambridge.org (opens in a new tab) 2 · Answer check returns Yes
Q9
1 · Guesser asks
Is it part of, or produced by, an animal?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it part of, or produced by, an animal?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Source summary (model-reported)
The source classifies eyebrow as an anatomical structure and defines it as the arched strip of hair or hairs above each eye socket. It also describes the eyebrow as an area of hairs above the eye and notes its functions in humans.
Open evsexplore.semantics.cancer.gov (opens in a new tab)Source summary (model-reported)
The source states that the scientific definition of animal includes the human species and that Linnaeus classified humans in the animal kingdom.
Open openstax.org (opens in a new tab) 2 · Answer check returns Yes
Q10
1 · Guesser asks
Is it normally found inside an animal's body while the animal is alive?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it normally found inside an animal's body while the animal is alive?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
The arched strip of hair on the bony ridge above each eye socket.Open evsexplore.semantics.cancer.gov (opens in a new tab)
An eyebrow is an area of short terminal hairs above each eye that follows the shape of the lower margin of the brow ridges of some mammals.Open en.wikipedia.org (opens in a new tab)
2 · Answer check returns No
Q11
1 · Guesser asks
Is it an external body covering or appendage of an animal, such as hair, feather, shell, or horn material?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it an external body covering or appendage of an animal, such as hair, feather, shell, or horn material?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Source summary (model-reported)
The NIH Elements of Morphology page defines the eyebrow as “the arch of hair on the brow” and identifies it as an anatomical structure in the periorbital region.
Open elementsofmorphology.nih.gov (opens in a new tab)Cambridge Dictionary defines eyebrow as “the line of short hairs above each eye in humans.”Open dictionary.cambridge.org (opens in a new tab)
2 · Answer check returns Yes
Q12
1 · Guesser asks
Is it primarily made of keratin?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it primarily made of keratin?"}}Oracle evidence3 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Source summary (model-reported)
The NIH Elements of Morphology defines the eyebrow as “the arch of hair on the brow.”
Open elementsofmorphology.nih.gov (opens in a new tab)Source summary (model-reported)
The source states that hair is a keratinous filament and is primarily made of dead, keratinized cells. It also specifically discusses hair around the eyes and says that eyebrow hair prevents sweat and particles from reaching the eyes.
Open ecampusontario.pressbooks.pub (opens in a new tab)Source summary (model-reported)
The PubMed abstract states that human hair is principally composed of hair keratins and keratin-associated proteins.
Open pubmed.ncbi.nlm.nih.gov (opens in a new tab) 2 · Answer check returns Yes
Q13
1 · Guesser asks
Is it typically found on mammals?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it typically found on mammals?"}}Oracle evidence1 model-reported source
The Oracle reported these excerpts and URLs. They are not independently checked.
An eyebrow is an area of short terminal hairs above each eye that follows the shape of the lower margin of the brow ridges of some mammals.Open en.m.wikipedia.org (opens in a new tab)
2 · Answer check returns Yes
Q14
1 · Guesser asks
Is it hair or fur, meaning thin filaments growing from skin?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it hair or fur, meaning thin filaments growing from skin?"}}Oracle evidence3 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Cambridge defines eyebrow as “the line of short hairs above each eye in humans.”Open dictionary.cambridge.org (opens in a new tab)
Source summary (model-reported)
The article is titled “The biology, structure, and function of eyebrow hair” and states that eyebrow hair follicles share the same basic structure as hair follicles elsewhere on the body, while having a shorter growing phase.
Open pubmed.ncbi.nlm.nih.gov (opens in a new tab)Merriam-Webster defines eyebrow as “the ridge over the eye or the hair growing usually in a line or arch on the skin over it.”Open merriam-webster.com (opens in a new tab)
2 · Answer check returns No
Q15
1 · Guesser asks
Is it normally located at the end of a limb or digit?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it normally located at the end of a limb or digit?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Source summary (model-reported)
Eyebrow: The arch of hair on the brow. The eyebrow is sometimes referred to as the supercilium.
Open elementsofmorphology.nih.gov (opens in a new tab)The arched strip of hair on the bony ridge above each eye socket.Open evsexplore.semantics.cancer.gov (opens in a new tab)
2 · Answer check returns No
Q16
1 · Guesser asks
Is it normally located on the head of the animal?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it normally located on the head of the animal?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
An eyebrow is an area of short terminal hairs above each eye that follows the shape of the lower margin of the brow ridges of some mammals.Open en.wikipedia.org (opens in a new tab)
Source summary (model-reported)
Eyebrows are described as a strip of hairs following the brow ridge above the eye, and the source discusses human eyebrows as a facial feature.
Open carta.anthropogeny.org (opens in a new tab) 2 · Answer check returns Yes
Q17
1 · Guesser asks
Does it protrude outward from the head as a pointed or elongated structure?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Does it protrude outward from the head as a pointed or elongated structure?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Source summary (model-reported)
The NIH defines the eyebrow as “the arch of hair on the brow” and states that eyebrows usually extend further laterally than medially in relation to the eye.
Open elementsofmorphology.nih.gov (opens in a new tab)Source summary (model-reported)
Merriam-Webster defines eyebrow as “the ridge over the eye or the hair growing usually in a line or arch on the skin over it.”
Open merriam-webster.com (opens in a new tab) 2 · Answer check returns No
Q18
1 · Guesser asks
Is it found in whales or other cetaceans?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it found in whales or other cetaceans?"}}Oracle evidence3 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
All members of this order are hairless, they may have a few hairs at birth, but have a thick layer of oil and fat called blubber under the skin.Open encyclopedia.com (opens in a new tab)
An eyebrow is an area of short terminal hairs above each eye that follows the shape of the lower margin of the brow ridges of some mammals.Open en.wikipedia.org (opens in a new tab)
Source summary (model-reported)
Dolphins have a few whiskers around their snout in the womb and when they are first born, however they soon lose them later in life. Amazon River dolphins keep these hairs into adulthood as sensory hairs. Humpback whale tubercles contain hair follicles with single hairs.
Open us.whales.org (opens in a new tab) 2 · Answer check returns No
Q19
1 · Guesser asks
Is it found only on the head, and not elsewhere on the body?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it found only on the head, and not elsewhere on the body?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Source summary (model-reported)
The eyebrow is defined as the arched strip of hair on the bony ridge above each eye. The page also identifies the eyebrow as an anatomical structure and maps it as a physical part of the head.
Open evsexplore.semantics.cancer.gov (opens in a new tab)Source summary (model-reported)
The NIH defines the eyebrow as the arch of hair on the brow and places it in the periorbital region, describing the brow as tissue overlying the supraorbital ridge.
Open elementsofmorphology.nih.gov (opens in a new tab) 2 · Answer check returns Yes
Q20
1 · Guesser asks
Is it normally present as a pair, with one on each side of the head?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it normally present as a pair, with one on each side of the head?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
An eyebrow is an area of short terminal hairs above each eye...Open en.wikipedia.org (opens in a new tab)
Source summary (model-reported)
Eyebrow: The arch of hair on the brow. The page treats the eyebrow as a standard anatomical feature and describes its medial, middle, and lateral parts.
Open elementsofmorphology.nih.gov (opens in a new tab) 2 · Answer check returns Yes
Q21
1 · Guesser asks
Is it hard and rigid in its normal state?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it hard and rigid in its normal state?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Brow: The soft tissue at the junction of the frontalis and orbicularis oculi muscles, overlying the bony supraorbital ridge. Eyebrow: The arch of hair on the brow.Open elementsofmorphology.nih.gov (opens in a new tab)
the line of short hairs above each eye in humansOpen dictionary.cambridge.org (opens in a new tab)
2 · Answer check returns No
Q22
1 · Guesser asks
Does it play a role in detecting sound?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Does it play a role in detecting sound?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Source summary (model-reported)
The area of curved, delicate hairs above our eyes are believed to channel unwanted moisture—sweat and rain in particular—away from the eye to help keep vision clear. They also help to block out light and filter dust and dirt that may fall into the eyes. Experts also believe that eyebrows play an important role in human communication and facial expression.
Open aao.org (opens in a new tab)Source summary (model-reported)
The human hearing system consists of two ears, located on the left and right sides of the head, the vestibulocochlear nerve, and the central auditory nervous system (CANS) – consisting of auditory centers in the brain and the connecting pathways in the brainstem.
Open usaarl.health.mil (opens in a new tab) 2 · Answer check returns No
Q23
1 · Guesser asks
Is it normally located near or around the eyes?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it normally located near or around the eyes?"}}Oracle evidence3 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
The arched strip of hair on the bony ridge above each eye.Open evsexplore.semantics.cancer.gov (opens in a new tab)
Eyebrow: The arch of hair on the brow. The eyebrows usually extend further laterally than medially, in relation to the eye.Open elementsofmorphology.nih.gov (opens in a new tab)
An eyebrow is an area of short terminal hairs above each eye that follows the shape of the lower margin of the brow ridges.Open en.wikipedia.org (opens in a new tab)
2 · Answer check returns Yes
Q24
1 · Guesser asks
Does it consist of many separate thin strands or filaments?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Does it consist of many separate thin strands or filaments?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
An eyebrow is an area of short terminal hairs above each eye that follows the shape of the lower margin of the brow ridges of some mammals.Open en.wikipedia.org (opens in a new tab)
the line of short hairs above each eye in humansOpen dictionary.cambridge.org (opens in a new tab)
2 · Answer check returns Yes
Q25
1 · Guesser asks
Is it located above the eye, between the eye and the forehead?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it located above the eye, between the eye and the forehead?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Source summary (model-reported)
The eyebrow is the arch of hair on the brow. The brow overlies the bony supraorbital ridge, and the eyebrows are described in relation to the eye.
Open elementsofmorphology.nih.gov (opens in a new tab)An eyebrow is an area of short terminal hairs above each eye.Open en.wikipedia.org (opens in a new tab)
2 · Answer check returns Yes
Q26
1 · Guesser asks
Is it directly attached to the edge of an eyelid?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it directly attached to the edge of an eyelid?"}}Oracle evidence3 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
The upper eyelid extends superiorly to the eyebrow... The transition from this thin eyelid skin to the thicker skin of the eyebrow (approximately 10 mm below the lower eyebrow hairs) is clinically evident.Open emedicine.medscape.com (opens in a new tab)
Source summary (model-reported)
The upper lid is bounded by the soft tissue overlying the inferior border of the bony supraorbital ridge and inferiorly by the lid margin. The eyebrow is described separately from the eyelid, while eyelashes are the hairs that emanate from eyelid margins.
Open elementsofmorphology.nih.gov (opens in a new tab)Source summary (model-reported)
The eyelid margin describes the portion located at the edge of the eyelid... It is the site of the eyelashes as well as the orifice of the meibomian glands.
Open aao.org (opens in a new tab) 2 · Answer check returns No
Q27
1 · Guesser asks
Is it normally present in humans?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is it normally present in humans?"}}Oracle evidence3 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Eyebrow: The arch of hair on the brow ... The eyebrow is sometimes referred to as the supercilium. It can be absent, malpositioned, or obstructed.Open elementsofmorphology.nih.gov (opens in a new tab)
As humans have evolved, our body hair and facial hair have diminished over time. But eyebrows and eyelashes remained a core part of our features.Open aao.org (opens in a new tab)
Source summary (model-reported)
The page identifies “Absent eyebrow” as a finding and defines it as “Absence of the eyebrow,” documenting that absence is an abnormal exception rather than the ordinary human condition.
Open evsexplore.semantics.cancer.gov (opens in a new tab) 2 · Answer check returns Yes
G
1 · Guesser guessesNot counted
eyebrow
The strip of hair growing above each human eye
Validator rationale The proposal identifies the general anatomical feature, the human eyebrow, and does not confuse it with an isolated hair, eye, cosmetic, or imitation.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"The strip of hair growing above each human eye","name":"eyebrow","question":null}} 2 · Validator returns Yes