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.
3,697 results for "vitamin D" — page 18 of 185
W_1_22 — Hittite Empire: Detailed Analysis
The Hittite Empire (c. 1650–1178 BCE) was one of the great powers of the Late Bronze Age, dominating Anatolia (modern Turkey) and rivaling Egypt, Babylon, and Assyria as a peer kingdom in the international system of the
W_1_19 — Hanseatic League: Medieval Trade Networks and Urban Power
The Hanseatic League (die Hanse) — a confederation of merchant guilds and market towns in northwestern and central Europe — dominated Baltic and North Sea trade from the mid-12th through the mid-17th century, at its peak
W_1_04 — Persian Civilization — Achaemenid Empire, Magi, and Cosmic Kingship
The Persian Empire (550–330 BCE under the Achaemenids, revived 224–651 CE under the Sassanids) created the largest empire the ancient world had seen — stretching from Libya to India, governing ~44% of the world's populat
W_1_01 — Olmec Civilization and Serpent-Jaguar Symbolism
The Olmec civilization (~1500–400 BCE), centered in the tropical lowlands of Mexico's Gulf Coast (modern Veracruz and Tabasco), is widely considered the "mother culture" of Mesoamerica — the civilization from which later
W_1_07 — Etruscan Religion and Mystery Traditions
The Etruscans (self-named Rasenna) — who dominated central Italy from ~800–300 BCE before being absorbed by Rome — possessed one of antiquity's most elaborate divination and religious systems, yet their language remains
W_1_28 — Bronze Age Collapse: The 1177 BCE Systems Failure and Mediterranean Civilizational Crisis
The Bronze Age Collapse (c. 1200–1150 BCE) destroyed or severely diminished every major civilization in the eastern Mediterranean within approximately 50 years — the Hittite Empire, Mycenaean Greece, the Egyptian New Kin
W_1_13 — Mesopotamian Daily Life and Urban Civilization
Beyond the well-known temples, ziggurats, and royal inscriptions, the cuneiform record preserves an extraordinarily detailed picture of everyday Mesopotamian life spanning over 3,000 years. Tens of thousands of clay tabl
W_1_02 — Minoan Civilization, Bull Cult, and the Labyrinth
The Minoan civilization (c. 2700–1450 BCE) on Crete represents one of Europe's earliest complex societies — preceding Classical Greece by over a millennium. Its archaeological record reveals a sophisticated culture cente
W_1_06 — Nabataean Civilization — Petra, Water Engineering, and Dushara
- [Quick Summary](#quick-summary)
W_1_03 — Harappan / Indus Valley Civilization — Mohenjo-daro, Undeciphered Script, and the Pashupati Seal
The Indus Valley / Harappan Civilization (c. 3300–1300 BCE, mature phase 2600–1900 BCE) was the largest of the three great Bronze Age civilizations — at its peak covering ~1.25 million km², with an estimated population o
W_1_12 — Persian Civilization — Achaemenid, Parthian, and Sassanid
Persian civilization produced three of antiquity's greatest empires — the Achaemenid (550–330 BCE), Parthian (247 BCE–224 CE), and Sassanid (224–651 CE) — that together dominated the Middle East, Central Asia, and parts
W_3_02 — Kingdom of Kush and Nubian Civilization — Kerma, Napata, Meroë
The Kingdom of Kush and broader Nubian civilization, centered along the Middle Nile in present-day Sudan, represents one of the most powerful and enduring polities in African history — yet remains chronically underrepres
W_3_20 — Mali Empire and Timbuktu: West African Scholarly and Trade Power
The Mali Empire (Manden Kurufaba, ~1235–1600 CE) — one of the largest and wealthiest states in pre-modern world history — dominated the West African Sahel and savanna, controlling trans-Saharan trade routes and the gold-
W_3_13 — Zanzibar and East African Trade Networks: Spice, Slaves, and Swahili Culture
Zanzibar — the archipelago off the coast of modern Tanzania — and the Swahili coast stretching from southern Somalia to northern Mozambique were the nexus of one of history's great maritime trade networks, connecting the
W_3_06 — Coptic and Ethiopian Christian Mystical Traditions
The Coptic and Ethiopian Christian traditions represent the oldest continuously operating Christian institutions in Africa, preserving theological, liturgical, and textual materials that have been lost or marginalized in
W_3_12 — Gupta Empire: Classical India's Golden Age
The Gupta Empire (c. 320–550 CE) is widely regarded as the "Golden Age" of classical India — a period of extraordinary achievement in literature, science, mathematics, philosophy, art, and architecture that set the cultu
W_3_08 — Yoruba Civilization: Ile-Ife, Orishas, and Diaspora Legacy
The Yoruba civilization — centered in southwestern Nigeria and the Republic of Benin — is one of the most culturally influential civilizations in African and world history, with a continuous urban tradition stretching ba
W_3_01 — Bantu Cosmology, Migration, and Iron Traditions
The Bantu expansion (~3000 BCE–500 CE) is one of the largest and most consequential human migrations in history: speakers of proto-Bantu languages from the Nigeria-Cameroon borderland spread across most of sub-Saharan Af
W_3_05 — Haitian Vodou and Afro-Diasporic Syncretic Religions
Afro-Diasporic religions — including Haitian Vodou, Cuban Santería (Regla de Ocha), Brazilian Candomblé, and related traditions — represent one of the most extraordinary examples of cultural survival and creative synthes
W_3_22 — Mapungubwe Kingdom
Mapungubwe (c. 1075–1290 CE) was the first complex state society in southern Africa, located at the confluence of the Limpopo and Shashe rivers in present-day South Africa. The site demonstrated the earliest evidence of
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