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.
2,633 results for "Zheng He" — page 51 of 132
Z_2_11 — Genetics of Immunity and MHC Diversity
The major histocompatibility complex (MHC) — known as the human leukocyte antigen (HLA) system in humans — is the most polymorphic gene region in the human genome, encoding cell-surface glycoproteins essential for adapti
Z_2_07 — Genetics of Disease Resistance
Infectious disease has been the most powerful selective force shaping the human genome, leaving signatures across thousands of loci. The best-understood example is sickle cell disease (HbS, Glu6Val in HBB): heterozygous
Z_2_23 — Immune System & Immunology
The immune system is a multi-layered defense network that protects organisms against pathogens including bacteria, viruses, fungi, and parasites. It comprises two interconnected arms: innate immunity, which provides rapi
Z_1_13 — DNA Repair Mechanisms and Genome Stability
Every human cell sustains an estimated 10,000–100,000 DNA lesions per day from endogenous sources alone — oxidative metabolism, spontaneous hydrolysis, replication errors, and reactive metabolites — while environmental m
Z_1_17 — Environmental Epigenetics & Toxicogenomics
Environmental epigenetics examines how chemical exposures, nutritional states, and ecological stressors modify gene expression without altering DNA sequence — through DNA methylation, histone modifications, and non-codin
Z_4_18 — Protein Misfolding and Prion Diseases
Prion diseases — transmissible spongiform encephalopathies (TSEs) — are fatal neurodegenerative disorders caused by the misfolding and self-propagating aggregation of a normal cellular protein (PrPᶜ) into a pathological
Z_4_02 — Stem Cells and Pluripotency
Stem cells — defined by the dual capacity for self-renewal (division producing at least one daughter cell retaining stemness) and differentiation (specialization into distinct cell types) — are the foundational building
Z_4_22 — Protein Chaperone Systems
Molecular chaperones are a diverse group of proteins that assist other proteins in achieving and maintaining their correct three-dimensional structures — preventing misfolding, aggregation, and toxic accumulation of non-
K_1_13 — Enactivism: Consciousness Through Action and Interaction
Enactivism is a radical approach to cognition and consciousness that rejects the traditional computational model of the mind (the brain as information-processing computer operating on internal representations of the exte
K_4_15 — Shared Death Experiences
Shared death experiences (SDEs) are reported phenomena in which a person who is physically healthy — typically a family member, caregiver, or bystander present at a death — describes experiencing some or all of the featu
K_5_06 — Dreaming and Consciousness: Why We Dream
Dreaming — the experience of structured hallucinatory consciousness during sleep — is one of the most remarkable features of the human mind and a central challenge for any theory of consciousness. Every night, for a tota
K_5_08 — Metacognition: Thinking About Thinking
Metacognition — literally "cognition about cognition" or "thinking about thinking" — refers to the human capacity to monitor, evaluate, and regulate one's own cognitive processes. When you realize you don't understand a
K_5_13 — Integrated World Models: Bayesian Brain and Consciousness
The Bayesian brain hypothesis proposes that the brain is fundamentally a prediction machine — it constructs and maintains internal generative models of the world (including the body), uses these models to generate predic
K_5_05 — Consciousness and Information Integration: Phi and Its Critics
Integrated Information Theory (IIT), developed primarily by neuroscientist Giulio Tononi (b. 1960) at the University of Wisconsin-Madison, with significant contributions from Christof Koch (Allen Institute for Brain Scie
E_2_27 — Mega-Tsunami History: Evidence for Catastrophic Wave Events
Mega-tsunamis — wave events with initial amplitudes of tens to hundreds of meters, far exceeding the 10–30 m waves generated by typical seismic tsunamis — are produced by catastrophic mechanisms including volcanic flank
E_2_12 — Great Oxygenation Event
The Great Oxygenation Event (GOE) — approximately 2.4–2.1 billion years ago — was one of the most transformative events in Earth's history: the first permanent rise of free molecular oxygen (O₂) in the atmosphere, from n
E_1_09 — Solar Storms and Miyake Events
The Sun periodically releases enormous bursts of energy — coronal mass ejections (CMEs) and solar proton events (SPEs) — that interact with Earth's magnetosphere and can have devastating consequences for technology-depen
ZG_2_07 — Dead Languages: Extinction, Documentation, and Revival
A dead language is one that no longer has any native speakers — no community transmits it to children as a first language through normal intergenerational communication. Of the approximately 7,000 languages spoken today,
ZG_3_09 — Syntax: Generative Grammar, Minimalism, and Sentence Structure
Syntax — the branch of linguistics that studies the structure of sentences — investigates the rules and principles governing how words combine into phrases, clauses, and sentences. Every language has a syntax: a system o
ZG_3_11 — Phonology: Sound Systems, Distinctive Features, and Phonological Rules
Phonology — the branch of linguistics concerned with the systematic organization of speech sounds in natural languages — studies not the physical sounds themselves (that is phonetics) but the abstract cognitive system by
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