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 20 of 185
W_2_20 — Vedic Civilizations
The Vedic period (c. 1500–500 BCE) represents the formative era of Indian civilization, encompassing the composition of the Rig Veda (the oldest surviving Indo-European literary text), the development of the fire sacrifi
W_2_28 — 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_2_03 — Daoism and Chinese Alchemy
Daoism is one of the world's oldest continuous philosophical-religious traditions, originating in China by at least the 4th century BCE and likely much earlier. Its alchemical tradition encompasses both waidan (external
W_2_13 — Sogdian Civilization: Silk Road Merchants and Cultural Brokers
The Sogdians — an Eastern Iranian people centered in the fertile valleys of the Zerafshan and Kashkadarya rivers (modern Uzbekistan and Tajikistan — the cities of Samarkand and Bukhara) — were the quintessential merchant
W_2_01 — Jōmon People and Pre-Yamato Japan
This document examines Jōmon People and Pre-Yamato Japan, a topic within the Global Traditions research area. Key areas of investigation include Chronological Framework, The Oldest Pottery in the World, Population and Se
W_2_12 — Khmer Empire Beyond Angkor: Jayavarman, Hydraulics, and Collapse
The Khmer Empire (c. 802–1431 CE) — centered in present-day Cambodia and extending across much of mainland Southeast Asia — was one of the most powerful and sophisticated civilizations in world history, yet its true scal
W_5_02 — Celtic and Druidic Traditions
The Celtic peoples — a linguistic and cultural group spread across Europe from Anatolia to Ireland between roughly 800 BCE and 400 CE — developed one of the most sophisticated pre-literate knowledge systems in the Wester
W_5_01 — Scythian / Steppe Nomad Traditions and Animal Style Art
The Scythians (c. 900–200 BCE) were a confederation of Iranian-speaking steppe nomads who dominated the Eurasian grasslands from the Black Sea to the Altai Mountains. Known primarily through Herodotus (Book IV) and spect
W_5_25 — Silk Road & Ancient Trade Networks
The Silk Road — a term coined by German geographer Ferdinand von Richthofen in 1877 (Seidenstraße) — refers to the interconnected network of overland and maritime trade routes linking China, Central Asia, the Indian subc
W_5_12 — Lapita Culture: Pacific Colonization and Pottery Horizon
The Lapita cultural complex (c. 1600/1500–500 BCE) was the foundational maritime culture that colonized Remote Oceania — transforming the Pacific from a barrier into a highway and ultimately giving rise to the Polynesian
W_5_26 — Chachapoya: Warriors of the Clouds
The Chachapoya ("People of the Clouds") were a pre-Inca civilization inhabiting the cloud forests of northeastern Peru's Amazonas region (~800–1470 CE). Known for their monumental fortress of Kuelap — a massive stone cit
W_5_07 — Sami Shamanism and Circumpolar Traditions
The circumpolar world — the vast band of Arctic and subarctic territory stretching from Scandinavia across Siberia to Alaska, Canada, and Greenland — is home to indigenous peoples whose spiritual traditions represent som
W_5_05 — Southeast Asian Spirit Traditions (Thai, Burmese, Khmer)
Southeast Asia presents one of the world's most complex religious landscapes, where Theravada Buddhism has been practiced for over a millennium in deep synthesis with pre-Buddhist animistic traditions rather than displac
W_5_23 — Viking Expansion: Detailed Analysis
The Viking Age (c. 793–1066 CE) was a period of dramatic Scandinavian expansion during which Norse seafarers, warriors, traders, and settlers from Denmark, Norway, and Sweden extended their reach across an astonishing ge
W_5_04 — Sufi Mysticism and Islamic Esotericism
Sufism (Arabic: tasawwuf) — the mystical/esoteric dimension of Islam — represents one of humanity's most profound traditions of direct experiential knowledge of the Divine (ma'rifa/gnosis). While orthodox Islam emphasize
W_5_33 — Khazar Khaganate: Turkic Empire and Religious Conversion
The Khazar Khaganate (c. 650–1048 CE) was a major Turkic empire that dominated the steppe and steppe-forest region between the Caspian Sea, the Black Sea, the Caucasus Mountains, and the Volga River — controlling key seg
W_5_20 — Renaissance Italian City-States: Commerce, Culture, and Innovation
The Italian Renaissance city-states (c. 1300–1600) — principally Florence, Venice, Milan, Genoa, and the Papal States, along with dozens of smaller polities — constituted one of history's most productive experiments in p
W_5_16 — The Venetian Republic: Maritime Empire, Statecraft, and Cultural Innovation
The Most Serene Republic of Venice (Serenissima Repubblica di Venezia) endured for 1,100 years (697–1797 CE), making it one of the longest-lived republics in history. Founded as a refuge community on marshy lagoon island
W_5_10 — Tamil Sangam Civilization and Dravidian Heritage
The Sangam period (c. 3rd century BCE – 3rd century CE, with literary traditions extending to ~5th century CE) represents the earliest extensively documented phase of Tamil civilization in southern India — a cultural, li
W_5_27 — Valdivia Culture: Oldest Pottery in the Americas
The Valdivia culture (~3500–1800 BCE) of coastal Ecuador produced the oldest known pottery in the Americas, making it one of the earliest complex societies in the Western Hemisphere. Discovered by Emilio Estrada in 1956
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