{"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", "generated": false}, {"id": "card_theory_stellar_nucleosynthesis_the_hr_diagram", "title": "Stellar nucleosynthesis & the HR diagram", "shelf": "theories", "surface": "secular", "snippet": "Stellar nucleosynthesis & the HR diagram — an engine domain that can touch it: astronomy. Calibration: partial — specific relations verify; the theory as a whole is not a sealable computation. Where t", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_periodic_law", "title": "Periodic law (Mendeleev)", "shelf": "theories", "surface": "secular", "snippet": "Periodic law (Mendeleev) — an engine domain that can touch it: periodic_table. Calibration: seals — element properties and group trends look up and compute. Arrange elements by atomic number and their", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_nutrient_cycling_agronomy", "title": "Nutrient cycling & agronomy (NPK, evapotranspiration)", "shelf": "theories", "surface": "secular", "snippet": "Nutrient cycling & agronomy (NPK, evapotranspiration) — an engine domain that can touch it: soil_science. Calibration: seals — nutrient budgets and ET rates compute. Elements cycle between soil, plant", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_dalton_s_atomic_theory", "title": "Dalton's atomic theory", "shelf": "theories", "surface": "secular", "snippet": "Dalton's atomic theory — an engine domain that can touch it: chemistry. Calibration: partial — mass ratios verify. Matter is made of indivisible atoms; all atoms of an element share a mass; compounds ", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_euclidean_geometry_the_parallel_postulate", "title": "Euclidean geometry & the parallel postulate", "shelf": "theories", "surface": "secular", "snippet": "Euclidean geometry & the parallel postulate — an engine domain that can touch it: geometry. Calibration: seals. Five postulates from which Euclid derived the plane geometry of the Elements (c. 300 BC)", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_organic_chemistry", "title": "Organic chemistry & functional groups (why life is built on carbon)", "shelf": "theories", "surface": "secular", "snippet": "Organic chemistry & functional groups (why life is built on carbon) — an engine domain that can touch it: chemistry. Calibration: seals — formulae, molar masses and isomer counts compute. Carbon forms", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_bohr_quantum_model_of_the_atom", "title": "Bohr / quantum model of the atom", "shelf": "theories", "surface": "secular", "snippet": "Bohr / quantum model of the atom — an engine domain that can touch it: atomic. Calibration: seals — energy levels and shell capacities compute. Electrons occupy discrete orbits with QUANTISED energies", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_big_bang_cosmology_expansion", "title": "Big Bang cosmology & expansion (Hubble's law)", "shelf": "theories", "surface": "secular", "snippet": "Big Bang cosmology & expansion (Hubble's law) — an engine domain that can touch it: astronomy. Calibration: partial — the Hubble relation verifies; the origin claim is map-only (RESONANCE). v = H₀d: r", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_nuclear_decay_binding_energy", "title": "Nuclear decay & binding energy", "shelf": "theories", "surface": "secular", "snippet": "Nuclear decay & binding energy — an engine domain that can touch it: nuclear_physics. Calibration: seals — half-lives, decay chains and mass-energy conversions compute. An unstable nucleus decays with", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_group_theory", "title": "Group theory & symmetry (the mathematics of what stays the same)", "shelf": "theories", "surface": "secular", "snippet": "Group theory & symmetry (the mathematics of what stays the same) — an engine domain that can touch it: mathematics. Calibration: seals — group orders, subgroup structure and symmetry counts compute. A", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_spectroscopy", "title": "Spectroscopy (how we know what a distant thing is made of)", "shelf": "theories", "surface": "secular", "snippet": "Spectroscopy (how we know what a distant thing is made of) — an engine domain that can touch it: optics. Calibration: seals — wavelengths, Doppler shifts and Wien's law all recompute and check. Split ", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_src_book_31624", "title": "A Brief History of Element Discovery, Synthesis, and Analysis — Glen W. Watson", "shelf": "gutenberg", "surface": "secular", "snippet": "A Brief History of Element Discovery, Synthesis, and Analysis, by Glen W. Watson. Subjects: Chemistry -- History; Chemical elements; Transuranium elements -- Synthesis. Read the full text (public doma", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_isbe_element_elements", "title": "ISBE: Element; Elements", "shelf": "encyclopedia", "surface": "witness", "snippet": "el'-e-ment, (ta stoicheia, \"the letters of the alphabet,\" \"the elements out of which all things are formed,\" \"the heavenly bodies,\" \"the fundamental principles of any art or science\"):\n(1) In 2Pe 3:10", "authority_tier": "reference", "source": "International Standard Bible Encyclopedia (1915), ed. James Orr — Public Domain (CrossWire SWORD module ISBE v2.2)", "generated": false}, {"id": "card_src_book_16058", "title": "Occult Chemistry: Clairvoyant Observations on the Chemical Elements — Annie Besant", "shelf": "gutenberg", "surface": "secular", "snippet": "Occult Chemistry: Clairvoyant Observations on the Chemical Elements, by Annie Besant. Subjects: Occultism; Chemical elements. Read the full text (public domain): https://www.gutenberg.org/ebooks/16058", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_src_book_21076", "title": "The First Six Books of the Elements of Euclid — Euclid", "shelf": "gutenberg", "surface": "secular", "snippet": "The First Six Books of the Elements of Euclid, by Euclid. Subjects: Euclid's Elements; Mathematics, Greek. Read the full text (public domain): https://www.gutenberg.org/ebooks/21076", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_src_book_69551", "title": "The natural and artificial disintegration of the elements An address by Professor Sir Ernest Rutherford — Ernest Rutherford", "shelf": "gutenberg", "surface": "secular", "snippet": "The natural and artificial disintegration of the elements An address by Professor Sir Ernest Rutherford, by Ernest Rutherford. Subjects: Chemical elements; Radioactivity; Atoms. Read the full text (pu", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_src_word_elements", "title": "elements", "shelf": "dictionary", "surface": "secular", "snippet": "elements: (noun) violent or severe weather (viewed as caused by the action of the four elements)", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_element_106", "title": "element 106", "shelf": "dictionary", "surface": "secular", "snippet": "element 106: (noun) a transuranic element — syn: seaborgium, Sg, atomic number 106", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_element_107", "title": "element 107", "shelf": "dictionary", "surface": "secular", "snippet": "element 107: (noun) a transuranic element — syn: bohrium, Bh, atomic number 107", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}]}