{"query": "Helium (He) — element 2", "count": 20, "results": [{"id": "card_ref_el_002", "title": "Helium (He) — element 2", "shelf": "chemistry", "surface": "secular", "snippet": "Atomic number 2. Symbol He. Standard atomic weight 4.002602. The helium atom carries 2 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. 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