{"query": "How fast water runs in an open channel", "count": 20, "results": [{"id": "card_theory_hydrologic_cycle_open_channel_flow", "title": "Hydrologic cycle & open-channel flow (Manning, Darcy)", "shelf": "theories", "surface": "secular", "snippet": "Hydrologic cycle & open-channel flow (Manning, Darcy) — an engine domain that can touch it: hydrology. Calibration: seals — Manning velocity, Darcy flow and catchment volumes compute. Water circulates", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_shannon_information_theory", "title": "Shannon information theory (entropy, channel capacity)", "shelf": "theories", "surface": "secular", "snippet": "Shannon information theory (entropy, channel capacity) — an engine domain that can touch it: information_theory. Calibration: seals. H = -Σ p log p. Information is measured by how much UNCERTAINTY a m", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_neuroscience", "title": "Neurons & the action potential (how a nerve carries a signal)", "shelf": "theories", "surface": "secular", "snippet": "Neurons & the action potential (how a nerve carries a signal) — an engine domain that can touch it: medicine. Calibration: seals — conduction velocities, membrane potentials and Nernst equilibria comp", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_fourier_analysis___signal_processing", "title": "Fourier analysis & signal processing", "shelf": "theories", "surface": "secular", "snippet": "Fourier analysis & signal processing — an engine domain that can touch it: mathematics. Calibration: seals. Any well-behaved signal is a sum of sinusoids, and the transform moves freely between the ti", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_diffie_hellman_key_exchange", "title": "Diffie-Hellman key exchange", "shelf": "theories", "surface": "secular", "snippet": "Diffie-Hellman key exchange — an engine domain that can touch it: cybersecurity. Calibration: partial — specific relations verify; the theory as a whole is not a sealable computation. Two parties agre", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (lone-domain seeding)", "readable": false, "generated": false}, {"id": "card_bridge_theory_quantum_information___entanglement__von_neumann_entr__shannon_information_theory", "title": "Bridge: Quantum information & entanglement (von Neumann entropy)  ↔  Shannon information theory (entropy, channel capacity)", "shelf": "bridges", "surface": "secular", "snippet": "Quantum information & entanglement (von Neumann entropy) and Shannon information theory (entropy, channel capacity) are the same form in different domains. von Neumann entropy S = -Tr(rho log rho) red", "authority_tier": "reference", "source": "The Bridges — cross-domain isomorphisms", "readable": false, "generated": false}, {"id": "card_water_rainwater", "title": "Harvesting rainwater", "shelf": "water", "surface": "secular", "snippet": "A roof is a large water catcher: ~600 gallons per inch of rain on a 1,000 sq ft roof. Channel gutters into a covered BARREL or tank. Use a FIRST-FLUSH diverter (or just discard the first few minutes) ", "authority_tier": "reference", "source": "U.S. EPA drinking-water guidance (public domain)", "readable": false, "generated": false}, {"id": "card_comms_emergency_frequencies", "title": "The frequencies to know for an emergency", "shelf": "communications", "surface": "secular", "snippet": "Worth writing on the radio: Marine VHF Ch 16 = 156.800 MHz (international distress/hailing, Coast Guard monitors). Aviation emergency = 121.500 MHz. NOAA weather 162.400–162.550 MHz (receive alerts). ", "authority_tier": "reference", "source": "International distress conventions (ITU / ICAO / IMO, public domain)", "readable": false, "generated": false}, {"id": "card_bridge_theory_shannon_information_theory__second_law_of_thermodynamics", "title": "Bridge: Shannon information theory (entropy, channel capacity)  ↔  Second law of thermodynamics (entropy)", "shelf": "bridges", "surface": "secular", "snippet": "Shannon information theory (entropy, channel capacity) and Second law of thermodynamics (entropy) are the same form in different domains. Shannon's H = -sum p log p and Boltzmann's S = k log W are the", "authority_tier": "reference", "source": "The Bridges — cross-domain isomorphisms", "readable": false, "generated": false}, {"id": "card_bridge_theory_landauer__shannon_information_theory", "title": "Bridge: Landauer's principle (erasing information costs heat)  ↔  Shannon information theory (entropy, channel capacity)", "shelf": "bridges", "surface": "secular", "snippet": "Landauer's principle (erasing information costs heat) and Shannon information theory (entropy, channel capacity) are the same form in different domains. THIS CLOSES THE INFORMATION-THERMODYNAMICS BRID", "authority_tier": "reference", "source": "The Bridges — cross-domain isomorphisms", "readable": false, "generated": false}, {"id": "card_bridge_theory_statistical_mechanics__shannon_information_theory", "title": "Bridge: Statistical mechanics (Boltzmann — why the second law is a counting argument)  ↔  Shannon information theory (entropy, channel capacity)", "shelf": "bridges", "surface": "secular", "snippet": "Statistical mechanics (Boltzmann — why the second law is a counting argument) and Shannon information theory (entropy, channel capacity) are the same form in different domains. Boltzmann's log W and S", "authority_tier": "reference", "source": "The Bridges — cross-domain isomorphisms", "readable": false, "generated": false}, {"id": "card_n_0a41c0e3298d", "title": "Pheromones — the molecule is the message", "shelf": "science", "surface": "secular", "snippet": "A pheromone is chemistry acting as language: a molecule IS a signal. Sealed: a\n20-component blend encodes 2^20 = 1,048,576 distinguishable messages (~4.3 bits per component),\nand an ant's trail evapor", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_comms_packet_over_handheld", "title": "Text over a handheld — packet radio (AX.25 / APRS) with a sound-card TNC", "shelf": "communications", "surface": "secular", "snippet": "A VHF handheld can carry TEXT: packet radio sends short digital frames (AX.25) as 1200-baud audio tones (AFSK) over the ordinary voice channel. The parts: the handheld, a cable to a sound-card interfa", "authority_tier": "reference", "source": "FCC Part 97 — Amateur Radio Service (U.S. regulation, public domain)", "readable": false, "generated": false}, {"id": "card_comms_prowords", "title": "Prowords — the words that carry meaning on the air", "shelf": "communications", "surface": "secular", "snippet": "Plain words with fixed meaning keep a channel clear: OVER (I'm done, your turn), OUT (done, no reply expected — never 'over and out'), ROGER (received), WILCO (received and will comply), SAY AGAIN (re", "authority_tier": "reference", "source": "FCC Part 97 — Amateur Radio Service (U.S. regulation, public domain)", "readable": false, "generated": false}, {"id": "card_comms_handheld_vhf_uhf", "title": "VHF/UHF FM handhelds (Baofeng-class) — voice and listening, and where the license lines fall", "shelf": "communications", "surface": "secular", "snippet": "A dual-band FM handheld (the $25 Baofeng class) transmits VOICE on 136–174 MHz (2 m) and 400–520 MHz (70 cm), typically 1–5 W: a few km simplex handheld to handheld, far more through a repeater on a h", "authority_tier": "reference", "source": "FCC Part 97 — Amateur Radio Service (U.S. regulation, public domain)", "readable": false, "generated": false}, {"id": "card_survival_build_shelter", "title": "Building a survival shelter", "shelf": "survival", "surface": "secular", "snippet": "Shelter beats almost everything but breathing — exposure kills fast. Get out of wind and wet, and INSULATE yourself from the ground (a foot of dry leaves or boughs) — you lose more heat to the cold ea", "authority_tier": "reference", "source": "U.S. Army Survival Manual FM 21-76 (public domain)", "readable": false, "generated": false}, {"id": "card_c_305b16a890ad", "title": "Pheromones — the molecule is the message ↔ The radio spectrum — one law from the cavity", "shelf": "connections", "surface": null, "snippet": "Radio waves (EM), DNA (genetic), morphemes (linguistic), neurotransmitters (neural), and the sealed receipt of this very engine (cryptographic) are all the same abstraction — Shannon's channel.  — a c", "authority_tier": "engine_derived", "source": "Concordance miner — 2026-07-11", "readable": false, "generated": false}, {"id": "card_c_9a732b4ecc5d", "title": "Pheromones — the molecule is the message ↔ The genome as information — and the algebra ", "shelf": "connections", "surface": null, "snippet": "Radio waves (EM), DNA (genetic), morphemes (linguistic), neurotransmitters (neural), and the sealed receipt of this very engine (cryptographic) are all the same abstraction — Shannon's channel.  — a c", "authority_tier": "engine_derived", "source": "Concordance miner — 2026-07-11", "readable": false, "generated": false}, {"id": "card_net_capacity", "title": "Capacity - Shannon's ceiling", "shelf": "codex", "surface": "secular", "snippet": "A channel carries at most C = B log2(1+S/N) bits/s (Shannon); no code beats it. Packets and error-correction live under it.", "authority_tier": "engine_derived", "source": "Narrow Highway — net", "readable": false, "generated": false}, {"id": "card_comms_frs_gmrs", "title": "FRS & GMRS — the license-cheap family radios", "shelf": "communications", "surface": "secular", "snippet": "The 'bubble-pack' walkie-talkies use 22 shared UHF channels (462–467 MHz). FRS is LICENSE-FREE (up to 2 watts on most channels) — fine for a family within a mile or two. GMRS reaches farther (up to 50", "authority_tier": "reference", "source": "FCC Part 95 — Personal Radio Services: GMRS/FRS/MURS/CB (U.S. regulation, public domain)", "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_hydrologic_cycle_open_channel_flow"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}