{"query": "Calcium (Ca) — element 20", "count": 20, "results": [{"id": "card_ref_el_020", "title": "Calcium (Ca) — element 20", "shelf": "chemistry", "surface": "secular", "snippet": "Atomic number 20. Symbol Ca. Standard atomic weight 40.078. The calcium atom carries 20 protons in its nucleus; its place in the periodic table is fixed by that count. Verified reference data.", "authority_tier": "reference", "source": "Verified reference — chemistry", "readable": false, "generated": false}, {"id": "card_theory_homeostasis_physiological_regulation", "title": "Homeostasis & physiological regulation", "shelf": "theories", "surface": "secular", "snippet": "Homeostasis & physiological regulation — an engine domain that can touch it: medicine. Calibration: partial — specific indices compute; the framework is empirical. A body holds its internal conditions", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_law_of_the_minimum", "title": "Liebig's law of the minimum (what actually limits growth)", "shelf": "theories", "surface": "secular", "snippet": "Liebig's law of the minimum (what actually limits growth) — an engine domain that can touch it: soil_science. Calibration: seals — nutrient ratios and deficiency thresholds compute. Growth is limited ", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_n_b04a994d0276", "title": "X-rays — shadows cast by 12-picometer light", "shelf": "science", "surface": "secular", "snippet": "Sealed: a 100 keV medical X-ray photon has a wavelength of 12.3 pm — smaller than an\natom: https://narrowhighway.com/s/2e10f3cd833c0da8ed1973eeb517c9de779e8956cd7d04eeee423aab280c4455 . That is why X-", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_span_cfbf2cc92ba4", "title": "SOAP-MAKJNC  MANUAL", "shelf": "practical", "surface": "secular", "snippet": "SODIUM  CAKBONAIE  (iAlDA  ASU). \n\nWhite  carbonate  of  soda  is  widely  distributed  in  na¬ \nture  the  source  of  supply  is  entirely  dependent  upon  the \nmanufactured  product.  Its  uses  a", "authority_tier": "primary_pd", "source": "Soap Making Manual", "readable": true, "generated": false}, {"id": "card_src_word_calcium", "title": "calcium", "shelf": "dictionary", "surface": "secular", "snippet": "calcium: (noun) a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals — syn: Ca, atomic nu", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_word_ca", "title": "ca", "shelf": "dictionary", "surface": "secular", "snippet": "ca: (noun) a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals — syn: calcium, atomic nu", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_etym_calcium", "title": "calcium", "shelf": "etymology", "surface": "secular", "snippet": "calcium: etymology (Webster 1913) — n.: [NL., from L. calx, calcis, lime; cf F. calcium. See Calx.]. 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_word_atomic_number_20", "title": "atomic number 20", "shelf": "dictionary", "surface": "secular", "snippet": "atomic number 20: (noun) a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals — syn: calc", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_etym_oxycalcium", "title": "oxycalcium", "shelf": "etymology", "surface": "secular", "snippet": "oxycalcium: etymology (Webster 1913) — a.: [Oxy- (a) + calcium.]. 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_tachhydrite", "title": "tachhydrite", "shelf": "etymology", "surface": "secular", "snippet": "tachhydrite: etymology (Webster 1913) — n.: [Gr. (Min.) Defn: A hydrous chloride of calcium and magnesium occurring in yellowish masses which rapidly deliquesce upon exposure. It is found in the salt ", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_src_etym_sphene", "title": "sphene", "shelf": "etymology", "surface": "secular", "snippet": "sphene: etymology (Webster 1913) — n.: [F. sphène, fr. Gr. (Min.) Defn: A mineral found usually in thin, wedge-shaped crystals of a yellow or green to black color. It is a silicate of titanium and cal", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_src_etym_apophyllite", "title": "apophyllite", "shelf": "etymology", "surface": "secular", "snippet": "apophyllite: etymology (Webster 1913) — n.: [Pref. apo- + Gr. (Min.) Defn: A mineral relating to the zeolites, usually occurring in square prisms or octahedrons with pearly luster on the cleavage surf", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_src_etym_pyrochlore", "title": "pyrochlore", "shelf": "etymology", "surface": "secular", "snippet": "pyrochlore: etymology (Webster 1913) — n.: [Pyro- + Gr. (Min.) Defn: A niobate of calcium, cerium, and other bases, occurring usually in octahedrons of a yellowish or brownish color and resinous luste", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_src_etym_cube", "title": "cube", "shelf": "etymology", "surface": "secular", "snippet": "cube: etymology (Webster 1913) — n.: [F. cube, L. cubus, fr. Gr. 1. (Geom.) Defn: A regular solid body, with six equal square sides. 2. (Math.) Defn: The product obtained by taking a number or quantit", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_survival_keep_chickens", "title": "Keeping a few laying hens", "shelf": "survival", "surface": "secular", "snippet": "A few hens give eggs, pest control, and manure. Give each bird room in a dry, draft-free coop with a roost, nest boxes, and a secure run — predators (raccoons, dogs, hawks) are the main loss, so hardw", "authority_tier": "reference", "source": "USDA poultry Farmers' Bulletins (public domain)", "readable": false, "generated": false}, {"id": "card_src_etym_hepar", "title": "hepar", "shelf": "etymology", "surface": "secular", "snippet": "hepar: etymology (Webster 1913) — n.: [L. hepar, hepatis, the liver, Gr. 1. (Old Chem.) Defn: Liver of sulphur; a substance of a liver-brown color, sometimes used in medicine. It is formed by fusing s", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_theory_vsepr_theory", "title": "VSEPR theory (molecular geometry)", "shelf": "theories", "surface": "secular", "snippet": "VSEPR theory (molecular geometry) — an engine domain that can touch it: molecular_geometry. Calibration: seals — shapes and bond angles predict directly. Valence Shell Electron Pair Repulsion: electro", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_src_etym_dissolution", "title": "dissolution", "shelf": "etymology", "surface": "secular", "snippet": "dissolution: etymology (Webster 1913) — n.: [OE. dissolucioun dissoluteness, F. dissolution, fr. L. dissolutio, fr. dissolvere. See Dissolve.]. From Webster's Revised Unabridged Dictionary (1913), pub", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_span_edf3b9c81714", "title": "When the liquid will drop in a continuous thread from the stirrer", "shelf": "sources", "surface": "secular", "snippet": "When  the  liquid  will  drop  in  a  continuous  thread  from \nthe  stirrer,  and  jellifies  on  cooling,  it  is  ready  for  the \n^^  cutting\"  process.  This  consists  in  throwing  in  salt  by", "authority_tier": "primary_pd", "source": "A treatise on chemistry applied to the manufacture of soap and candles; being a thorough exposition, in all their minuti", "readable": true, "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_ref_el_020"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}