RESEARCH BASE
Search 3,721 documents across 34 fields — every claim tier-rated by evidence
3,633 are the core, quality-scored corpus (34 lettered sections — see How We Work); the remaining 88 are cross-corpus synthesis documents (68 InterDocs, 12 Connections, 8 Theories) also indexed here.
3,510 results for "Li Si" — page 9 of 176
ZH_4_02 — Precession in Ancient Culture: Hamlet's Mill Thesis
Hamlet's Mill: An Essay on Myth and the Frame of Time (1969), by MIT historian of science Giorgio de Santillana and ethnologist Hertha von Dechend, is one of the most intellectually ambitious — and controversial — works
ZH_5_09 — Ancient Observatories: Kokino, Goseck, and Pre-Stonehenge Horizon Sites
Stonehenge is the world's most famous archaeoastronomical site — but it is neither the earliest nor the only ancient structure demonstrating systematic astronomical observation. Across Europe, the Near East, and Africa,
ZH_5_06 — Horizon Astronomy: Skyline Observations, Foresights, and Horizonal Calendars
Horizon astronomy — the practice of observing where celestial bodies rise and set along the natural skyline — is the most ancient, most widespread, and most practical form of astronomical observation. Unlike meridian tra
ZH_5_13 — Archaeoastronomical Controversies: Precision Debates and Methodological Limits
Archaeoastronomy — the study of how past cultures understood and used celestial phenomena — has been marked by recurring methodological controversies since its modern founding in the 1960s. The central problem: when an a
ZH_5_10 — Naked-Eye Observational Limits: Precision, Techniques, and Ancient Achievement
For all but the last ~400 years of human history, every astronomical observation was made with the unaided eye. Understanding the limits and capabilities of naked-eye observation is therefore essential for evaluating anc
ZH_2_04 — Cosmic Cycle Doctrines: Great Year, Yuga, Precession Ages
Many civilizations have conceived of cosmic time as cyclical rather than linear — repeating through grand cycles of creation, decline, and renewal that span thousands or millions of years. The most influential of these d
ZF_2_15 — Jellyfish Ecology: Blooms, Climate Change, and Gelatinous Dominance
Jellyfish (Cnidaria: Scyphozoa, Cubozoa, Hydrozoa, and the distantly related Ctenophora) are among the oldest and most ecologically significant animals in the ocean — with a fossil record extending over 500 million years
ZF_1_14 — Ocean-Atmosphere Coupling: Heat Exchange, Evaporation, and Weather
The ocean-atmosphere interface — the boundary between Earth's two great fluid envelopes — is the planet's most important energy exchange surface. The ocean absorbs approximately 93% of the excess heat trapped by anthropo
Z_5_06 — Circulating Cell-Free DNA: Liquid Biopsies and Non-Invasive Diagnostics
Circulating cell-free DNA (cfDNA) — fragments of DNA released into the bloodstream and other body fluids through cell death (apoptosis, necrosis), active secretion, and other mechanisms — has emerged as a revolutionary t
Z_5_09 — Single-Cell Genomics: Profiling Biology One Cell at a Time
Single-cell genomics — the set of technologies that enable the measurement of DNA sequences, RNA expression, protein levels, or epigenetic states in individual cells rather than bulk populations — has revolutionized biol
Z_2_18 — Pharmacogenomics and Precision Medicine
Pharmacogenomics — the study of how genetic variation affects individual responses to drugs — aims to replace the "one-size-fits-all" prescribing model with genotype-guided therapy, selecting the right drug at the right
Z_4_13 — Membrane Biology: Lipid Bilayers, Rafts, and Cellular Boundaries
Biological membranes — the lipid bilayer structures that define cells and compartmentalize their interiors — are fundamental to all life on Earth. Every cell is bounded by a plasma membrane that separates the interior (c
Z_4_10 — Signal Transduction: How Cells Communicate
Signal transduction — the molecular mechanisms by which cells detect, interpret, and respond to external signals (hormones, growth factors, neurotransmitters, cytokines, environmental cues) — is one of the central organi
K_1_11 — Dualism: Mind-Body Problem Across Philosophy and Neuroscience
The mind-body problem — the question of how subjective mental experience (consciousness, thought, sensation, emotion) relates to the physical body (brain, nervous system, matter) — is arguably the oldest and most persist
K_5_11 — Synaesthesia and Consciousness: Cross-Modal Binding
Synaesthesia (British spelling; "synesthesia" in American English) is a neurological condition in which stimulation of one sensory or cognitive pathway automatically triggers an involuntary experience in a second, unstim
E_3_09 — Messinian Salinity Crisis
The Messinian Salinity Crisis (MSC) — approximately 5.96–5.33 million years ago (late Miocene) — was one of the most dramatic geological events in the Cenozoic: the near-complete desiccation (drying up) of the Mediterran
E_5_04 — Maya Classic Period Collapse
The Maya Classic Period Collapse (c. 800–1000 CE) was the dramatic and largely irreversible abandonment of dozens of major lowland Maya city-states across the southern Maya lowlands (modern-day Guatemala, Belize, western
E_5_06 — Holocene Sixth Mass Extinction: Current Biodiversity Crisis
The Holocene "Sixth Mass Extinction" hypothesis holds that current species loss rates are 100–1,000 times the normal background extinction rate, driven primarily by human activity: habitat destruction, overexploitation,
E_5_02 — The Ordovician-Silurian Mass Extinction
The Late Ordovician mass extinction (c. 445–444 million years ago, at the Ordovician-Silurian boundary) was the second-most severe extinction event in Earth's history in terms of percentage of species lost — approximatel
ZG_2_19 — Creole Languages & Contact Linguistics
Creole languages — fully grammaticalized natural languages that arise from contact between speakers of mutually unintelligible languages — are among the most important phenomena in linguistics, bearing directly on fundam
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