Life Structural Challenge Ledger
Structural tests for a theory of life as such: definition, origin, substrate, code, metabolism, morphology, evolution, cognition, artificial life, and life beyond Earth.
Life in the Structural Challenge Ledger
A theory of life does not need to predict rabbits. It must explain what kind of structure makes life possible, why stable living organisation appears, how code, metabolism, heredity, repair, and evolution arise, and which structural attractors make broad life regimes possible.
Life challenges are not imported wholesale from public open-problem lists. The Wikipedia biology and neuroscience lists are used as raw source feeds for v1.0 historical record, but the canonical ledger is curated by structural relevance.
A challenge enters the canonical ledger only if it tests a declared E₂ obligation: life definition, boundary, origin, substrate generality, code, heredity, metabolism, repair, evolution, morphology, ecology, cognition, artificial life, or life beyond Earth.
Five canonical clusters (29 challenges)
| Cluster | Range | Focus |
|---|---|---|
| Definition, boundary, persistence | LIFE-SC-01..05 | What is life as a structural class; boundary and individuality; life/non-life phase boundary; metabolism and energy throughput; homeostasis, repair, and persistence. |
| Origin, substrate, life-as-could-be | LIFE-SC-06..10 | Abiogenesis as first persistence event; structural favorability vs contingency; substrate independence and nonterran life; extraterrestrial life and biosignatures; artificial and synthetic life. |
| Molecular and code architecture | LIFE-SC-11..16 | Biological homochirality; universal energy currency and chemiosmotic coupling; origin and structure of the genetic code; central dogma and code-to-form morphism; folding and sequence-to-structure; protocell, membrane, and compartmentalisation. |
| Evolution, morphology, tree | LIFE-SC-17..24 | LUCA and tree-of-life topology; three-domain sector taxonomy and eukaryogenesis; major evolutionary transitions and multicellularity; open-ended evolution and evolvability; sexual reproduction; morphogenesis, body plans, and organ-size control; biological time and rhythms; ageing, senescence, and repair budget. |
| Ecology, cognition, bridge | LIFE-SC-25..29 | Ecosystems, superorganisms, and Life basins; agency, cognition, and decision-making; neural computation, perception, learning, and memory; consciousness, language, and life-mind bridge; cosmic life and non-organism carriers. |
Active construction
This domain ledger is in active construction. The five-cluster curation and the E₂ obligations that gate canonical entry are settled; detailed per-challenge items will appear on this page as the construction spine reaches each cluster.
For the program-wide framework, see the Structural Challenge Ledger overview. For τ’s life-side results, see the Life results hub and the Life world readout.
What this ledger does not claim
- It does not claim τ explains every biological detail.
- It does not assert external biological consensus on any τ response.
- Token-specific, taxon-specific, medically narrow, or historically contingent items are not canonical structural challenges.
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