{"query": "How fast a 100-metre ocean swell travels", "count": 20, "results": [{"id": "card_theory_physical_oceanography", "title": "Physical oceanography (hydrostatics, tides)", "shelf": "theories", "surface": "secular", "snippet": "Physical oceanography (hydrostatics, tides) — an engine domain that can touch it: oceanography. Calibration: seals — pressure with depth and tidal periods compute. Pressure rises about one atmosphere ", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_comms_antenna_basics", "title": "Antennas — the cheapest way to double your range", "shelf": "communications", "surface": "secular", "snippet": "A better antenna beats more power almost every time. Key ideas: HEIGHT wins for VHF/UHF — they go line-of-sight, so raising the antenna a few metres can double reach. Length matters: a common field an", "authority_tier": "reference", "source": "U.S. Army field antenna & signaling references (public domain)", "readable": false, "generated": false}, {"id": "card_works_wave_speed", "title": "How fast a 100-metre ocean swell travels", "shelf": "the-works", "surface": "secular", "snippet": "In deep water a wave's speed grows with its wavelength: c = √(gλ/2π). A 100 m swell moves at about 12.5 m/s — long waves outrun short ones and arrive first.  Worked & sealed by the engine — c = √(9.81", "authority_tier": "verified", "source": "The Works — worked & sealed", "readable": false, "generated": false}, {"id": "card_works_concrete", "title": "The concrete for a slab", "shelf": "the-works", "surface": "secular", "snippet": "A slab 5 m by 4 m and 10 cm deep needs exactly 2 cubic metres of concrete — length × width × depth, the estimate every pour begins with.  Worked & sealed by the engine — V = 5·4·0.1 = 2 m³.  [HOLDS; o", "authority_tier": "verified", "source": "The Works — worked & sealed", "readable": false, "generated": false}, {"id": "card_works_constant_c", "title": "The speed of light is a defined exact number", "shelf": "the-works", "surface": "secular", "snippet": "Since 1983 the metre is defined so that light travels 299,792,458 metres per second exactly — a constant of nature promoted to a fixed integer.  Worked & sealed by the engine — c = 299,792,458 m/s (ex", "authority_tier": "verified", "source": "The Works — worked & sealed", "readable": false, "generated": false}, {"id": "card_works_acoustics", "title": "The wave equation for sound", "shelf": "the-works", "surface": "secular", "snippet": "For any wave, speed = frequency × wavelength. A 343 Hz tone with a one-metre wavelength travels at 343 m/s — the speed of sound in air.  Worked & sealed by the engine — c = f·λ = 343·1 = 343 m/s.  [HO", "authority_tier": "verified", "source": "The Works — worked & sealed", "readable": false, "generated": false}, {"id": "card_floor_metrology", "title": "Metrology — measurement and the SI", "shelf": "codex", "surface": "secular", "snippet": "Measurement is the ground of every sealed number: the SI defines its units by fixing constants (the metre by c), and every unit converts by exact factors. Pillars rest on the instruments (the 6-consta", "authority_tier": "engine_derived", "source": "Narrow Highway — metro", "readable": false, "generated": false}, {"id": "card_src_pron_metres", "title": "metres", "shelf": "pronunciation", "surface": "secular", "snippet": "metres: pronounced (ARPABET) M IY1 T ER0 Z. From the CMU Pronouncing Dictionary — the standard machine-readable pronunciations of North American English.", "authority_tier": "reference", "source": "CMU Pronouncing Dictionary (cmudict) — BSD-2-Clause, Carnegie Mellon", "readable": false, "generated": false}, {"id": "card_src_pron_metre", "title": "metre", "shelf": "pronunciation", "surface": "secular", "snippet": "metre: pronounced (ARPABET) M IY1 T ER0. From the CMU Pronouncing Dictionary — the standard machine-readable pronunciations of North American English.", "authority_tier": "reference", "source": "CMU Pronouncing Dictionary (cmudict) — BSD-2-Clause, Carnegie Mellon", "readable": false, "generated": false}, {"id": "card_src_book_69177", "title": "Mirth and metre — Frank E. (Frank Edward) Smedley", "shelf": "gutenberg", "surface": "secular", "snippet": "Mirth and metre, by Frank E. (Frank Edward) Smedley. Subjects: English wit and humor; Humorous poetry, English; Legends -- Poetry. Read the full text (public domain): https://www.gutenberg.org/ebooks/", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "readable": true, "generated": false}, {"id": "card_src_word_square_metre", "title": "square metre", "shelf": "dictionary", "surface": "secular", "snippet": "square metre: (noun) a centare is 1/100th of an are — syn: square meter, centare", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_word_cubic_metre", "title": "cubic metre", "shelf": "dictionary", "surface": "secular", "snippet": "cubic metre: (noun) a metric unit of volume or capacity equal to 1000 liters — syn: kiloliter, kilolitre, cubic meter", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_etym_meter_metre", "title": "meter; metre", "shelf": "etymology", "surface": "secular", "snippet": "meter; metre: etymology (Webster 1913) — n.: [OE. metre, F. mètre, L. metrum, fr. Gr. ma to measure. See Mete to measure.]. From Webster's Revised Unabridged Dictionary (1913), public domain.", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_src_etym_megameter_megametre", "title": "megameter; megametre", "shelf": "etymology", "surface": "secular", "snippet": "megameter; megametre: etymology (Webster 1913) — n.: [Mega- + meter, metre, n., 2.]. From Webster's Revised Unabridged Dictionary (1913), public domain.", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_metro_base_units", "title": "Base units - defined by constants", "shelf": "codex", "surface": "secular", "snippet": "Seven SI units built from seven fixed constants: the metre from c (sealed), the kilogram from the Planck constant, the second from caesium. Anchored to nature.", "authority_tier": "engine_derived", "source": "Narrow Highway — metro", "readable": false, "generated": false}, {"id": "card_seal_a219385ec01c2637f79139bb6d1d2a6722199155c8b7026bbcda72d541650d54", "title": "Receipt a219385ec01c… — sealed: record", "shelf": "seals", "surface": "secular", "snippet": "{\n \"anchors\": [],\n \"axis_coords\": {\n  \"axis\": \"mathematics\",\n  \"dimensions\": [\n   \"reasoning\"\n  ]\n },\n \"gate_results\": [\n  {\n   \"details\": {\n    \"broken_at\": null,\n    \"confirmed_steps\": 1,\n    \"error", "authority_tier": "engine_derived", "source": "Narrow Highway engine — sealed record", "readable": false, "generated": false}, {"id": "card_seal_f6710da2b942874eb628a519b9ff2906db3511ba45ce25bdeaba3172283b7b2d", "title": "Receipt f6710da2b942… — sealed: record", "shelf": "seals", "surface": "secular", "snippet": "{\n \"anchors\": [],\n \"axis_coords\": {\n  \"axis\": \"mathematics\",\n  \"dimensions\": [\n   \"reasoning\"\n  ]\n },\n \"gate_results\": [\n  {\n   \"details\": {\n    \"broken_at\": null,\n    \"confirmed_steps\": 1,\n    \"error", "authority_tier": "engine_derived", "source": "Narrow Highway engine — sealed record", "readable": false, "generated": false}, {"id": "card_seal_fe39f984f0eee601d62e4453349bdd31cbd5dca5c03772faad7947855075ca40", "title": "Receipt fe39f984f0ee… — sealed: record", "shelf": "seals", "surface": "secular", "snippet": "{\n \"anchors\": [],\n \"axis_coords\": {\n  \"axis\": \"mathematics\",\n  \"dimensions\": [\n   \"reasoning\"\n  ]\n },\n \"gate_results\": [\n  {\n   \"details\": {\n    \"broken_at\": null,\n    \"confirmed_steps\": 1,\n    \"error", "authority_tier": "engine_derived", "source": "Narrow Highway engine — sealed record", "readable": false, "generated": false}, {"id": "card_seal_5c91fd9dc3d9e1ce146ed27f7b4f26842a5ce19cc1c202e2a067617a62cee19c", "title": "Receipt 5c91fd9dc3d9… — sealed: record", "shelf": "seals", "surface": "secular", "snippet": "{\n \"anchors\": [],\n \"axis_coords\": {\n  \"axis\": \"mathematics\",\n  \"dimensions\": [\n   \"reasoning\"\n  ]\n },\n \"gate_results\": [\n  {\n   \"details\": {\n    \"broken_at\": null,\n    \"confirmed_steps\": 1,\n    \"error", "authority_tier": "engine_derived", "source": "Narrow Highway engine — sealed record", "readable": false, "generated": false}, {"id": "card_harmony_h017", "title": "Temptation in the wilderness (3 of 4 gospels)", "shelf": "scripture", "surface": "witness", "snippet": "Temptation in the wilderness — Preparation for Ministry. Recorded by 3 of the four gospels: Matthew 4:1-11; Mark 1:12-13; Luke 4:1-13. Read them side by side at /harmony.html; the text is the World En", "authority_tier": "reference", "source": "World English Bible (public domain) + the standard study tables", "readable": false, "generated": false}], "house": {"door": "FIND", "kind": "cards", "trail": "results", "seal": null, "next_step": {"do": "open the top card", "door": "FIND", "tool": "card_get", "params": {"id": "card_theory_physical_oceanography"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}