RESEARCH BASE

Search 3,721 documents across 34 fields — every claim tier-rated by evidence

3,721 Documents 34 Sections 43,625 Citations 34,852 Keywords Indexed 4 Evidence Tiers

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.

1,207 results for "Level 4" — page 18 of 61

X_3_04 Verified Medicine & Healing

X_3_04 — Forensic Medicine and Pathology

Forensic medicine — the application of medical knowledge to legal questions, especially the determination of cause, manner, and circumstances of death — has ancient roots but developed as a formal discipline primarily fr

forensic medicine pathology autopsy forensic science toxicology legal medicine
X_3_14 Verified Medicine & Healing

X_3_14 — Cardiology: The Science of the Heart

Cardiology — the branch of medicine dealing with disorders of the heart and cardiovascular system — addresses the leading cause of death worldwide: cardiovascular disease (CVD), responsible for ~17.9 million deaths per y

cardiology heart cardiovascular coronary artery disease ECG Einthoven
X_3_24 Verified Medicine & Healing

X_3_24 — Gastroenterology: Microbiome Therapeutics, IBD & Gut-Brain Axis

Gastroenterology — the study and treatment of the digestive system — has undergone a revolution driven by three transformative discoveries: the bacterial etiology of peptic ulcers, the gut microbiome's role in systemic h

gastroenterology microbiome inflammatory-bowel-disease ibd crohns-disease ulcerative-colitis
Verified

INTERDOC_74 — Transgenerational Epigenetic Inheritance: Confirmed Mechanisms and Honest Limits

[KEY FINDING] Specific environmentally-induced epigenetic states (notably from severe famine and from controlled fear-conditioning paradigms) can survive embryonic reprogramming and influence offspring phenotype across o

epigenetic inheritance DNA methylation Dutch Hunger Winter intergenerational trauma FKBP5 IGF2
W_4_10 Verified World Civilizations

W_4_10 — Pueblo, Hopi, and Navajo Civilizations of the American Southwest

The Pueblo, Hopi, and Navajo (Diné) peoples of the American Southwest represent some of the most culturally continuous civilizations in the Americas, with archaeological records extending over 2,000 years and oral tradit

Pueblo Hopi Navajo Diné Ancestral Puebloan Anasazi
W_4_20 Verified World Civilizations

W_4_20 — Olmec Civilization: Detailed Analysis

The Olmec civilization (c. 1500–400 BCE) of the tropical lowlands of the Gulf Coast of Mexico — primarily in the modern states of Veracruz and Tabasco — is widely regarded as the first major civilization of Mesoamerica a

Olmec San Lorenzo La Venta Tres Zapotes colossal heads Mesoamerica
W_4_01 Verified World Civilizations

W_4_01 — Maya Epigraphy, Astronomy, and Calendar Science

The Maya civilization developed one of the most sophisticated writing systems in the pre-Columbian Americas — a mixed logographic-syllabic script that recorded history, astronomy, mythology, and ritual on stone monuments

Maya Mayan epigraphy hieroglyphs Long Count calendar
W_4_18 Verified World Civilizations

W_4_18 — Tiwanaku and Wari: Pre-Inca Andean Empires

Tiwanaku (Tiahuanaco) and Wari (Huari) were the two dominant polities of the Andean Middle Horizon (c. 500–1000 CE), together representing the first large-scale expansionary states in South American history and the most

Tiwanaku Wari Huari Middle Horizon Andean pre-Inca
W_4_12 Credible World Civilizations

W_4_12 — Tiwanaku: Altiplano Civilization and Raised-Field Agriculture

Tiwanaku (also spelled Tiahuanaco) was a major pre-Columbian civilization centered at the site of the same name on the Bolivian Altiplano (high plateau), approximately 3,850 meters above sea level and 20 km southeast of

Tiwanaku Tiahuanaco Altiplano Lake Titicaca raised fields suka kollus
W_4_07 Verified World Civilizations

W_4_07 — Amazonian Traditions, Plant Teachers, and the Ayahuasca Complex

The Amazon Basin — the world's largest tropical rainforest — is home to approximately 400 indigenous groups with an extraordinary tradition of plant-based knowledge unmatched anywhere on Earth. At the center of this trad

ayahuasca DMT Banisteriopsis caapi Psychotria viridis Shipibo icaros
W_4_04 Verified World Civilizations

W_4_04 — Mississippian Culture — Cahokia, Mound Builders, and the Southeastern Ceremonial Complex

Cahokia, located near present-day East St. Louis, Illinois, was the largest pre-Columbian settlement north of Mexico, reaching a peak population of 20,000 or more around 1050-1200 CE. The site features Monks Mound — the

Cahokia Mississippian culture mound builders Monks Mound Southeastern Ceremonial Complex SECC
W_4_02 Verified World Civilizations

W_4_02 — Polynesian Navigation and Rapa Nui

The Polynesian settlement of the Pacific Ocean — the largest migration in human prehistory — colonized virtually every inhabitable island across 16 million km² of open ocean using non-instrument navigation techniques of

Polynesia Polynesian navigation star compass wayfinding Rapa Nui Easter Island
W_4_16 Verified World Civilizations

W_4_16 — Taíno Civilization: The Indigenous Caribbean Before and After Contact

The Taíno were the dominant indigenous people of the Greater Antilles (Hispaniola, Puerto Rico, Jamaica, Cuba, and the Bahamas) at the time of European contact in 1492. Descended from Arawakan-speaking migrants who origi

Taíno Caribbean Arawak Hispaniola Puerto Rico Columbus
W_4_06 Credible World Civilizations

W_4_06 — Dreamtime Songlines and Aboriginal Navigation

Songlines (also called dreaming tracks or song paths) are one of humanity's most extraordinary intellectual achievements — a vast network of songs that simultaneously encode mythological narrative, geographic navigation

songlines dreaming tracks Aboriginal Australian navigation oral map tjukurpa
W_4_05 Verified World Civilizations

W_4_05 — Iroquois Confederacy and the Great Law of Peace

The Haudenosaunee (People of the Longhouse), commonly known as the Iroquois Confederacy, created one of the world's oldest continuous systems of participatory governance, uniting five — later six — nations under the Grea

Haudenosaunee Iroquois Confederacy Great Law of Peace Gayanashagowa wampum Hiawatha
W_4_13 Credible World Civilizations

W_4_13 — Aztec Empire: Tenochtitlan, Sacrifice, and Cosmovision

The Aztec Empire — more precisely the Mexica-led Triple Alliance (c. 1428–1521 CE) of Tenochtitlan, Texcoco, and Tlacopan — was the dominant political and military power in Mesoamerica at the time of the Spanish arrival.

Aztec Mexica Tenochtitlan Triple Alliance human sacrifice Templo Mayor
W_4_09 Verified World Civilizations

W_4_09 — Indonesian Megalithic Living Traditions — Nias, Sumba, Toraja

Indonesia harbors what may be the world's most significant collection of living megalithic traditions — cultures that continue to quarry, transport, and erect massive stone monuments using methods broadly analogous to th

Indonesia megalithic living tradition Nias Sumba Toraja
W_4_00 World Civilizations

W_4_00 — Americas Pacific Indigenous: Subfolder Summary

W_4_03 Verified World Civilizations

W_4_03 — Andean Civilizations — Chavín, Nazca, Tiwanaku, Caral

The Andean region produced one of the world's great independent civilizations — arguably the most underappreciated. From Caral (~3000 BCE, contemporary with Egyptian pyramids and Sumerian Ur) to the Inca (conquered by Sp

Andean civilization Chavín de Huántar Chavín Lanzón jaguar deity Nazca Lines
W_4_14 Credible World Civilizations

W_4_14 — Inca Empire: Tawantinsuyu, Quipu, and Vertical Archipelago

Tawantinsuyu ("The Four Parts Together") — the Inca Empire — was the largest empire in pre-Columbian America and the largest empire in the Southern Hemisphere, stretching ~4,000 km along the Andes from modern Colombia to

Inca Tawantinsuyu Cusco quipu khipu Machu Picchu