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 135 of 176
S_1_11 — Machine Learning and Deep Learning
Machine learning (ML) is the subfield of AI in which systems learn patterns from data rather than being explicitly programmed. Deep learning uses artificial neural networks with many layers (hence "deep") to learn hierar
S_3_12 — Biodegradable Materials and Green Chemistry
Green chemistry — formalized by Paul Anastas and John Warner (1998, Green Chemistry: Theory and Practice) with Twelve Principles including waste prevention, atom economy, less hazardous synthesis, designed degradation, r
S_3_09 — Vertical Farming and Controlled Environment Agriculture
Vertical farming grows crops in stacked layers inside controlled indoor environments, typically using hydroponics (nutrient-rich water without soil), aeroponics (misting roots with nutrient solution), or aquaponics (inte
S_2_18 — Biosecurity and Dual-Use Research: Risks of Advanced Biotechnology
Biosecurity — the prevention of misuse of biological agents, technologies, and knowledge for hostile purposes — has become a critical concern as advances in synthetic biology, DNA synthesis, gene editing (CRISPR-Cas9), a
F_1_26 — Pre-Columbian Chicken DNA & Trans-Pacific Contact
The question of whether chickens (Gallus gallus domesticus) were present in South America before the arrival of Europeans in 1492 is a seemingly mundane zoological problem with profound implications for the history of pr
F_1_11 — Sweet Potato Paradox — Pre-Columbian Trans-Pacific Contact Evidence
The sweet potato paradox — the presence of Ipomoea batatas (a plant of unambiguous South American origin) across Polynesia in pre-Columbian contexts — is the single most widely accepted piece of evidence for trans-Pacifi
F_1_24 — Phoenician Contact with the Americas
The hypothesis that Phoenician or Carthaginian sailors reached the Americas before Columbus is one of the most persistent and emotionally charged claims in the field of pre-Columbian transatlantic contact — a proposition
F_1_05 — Chinese Maritime Exploration Before and Including Zheng He
China possessed the world's most advanced maritime technology for centuries, culminating in Admiral Zheng He's seven extraordinary voyages (1405–1433) across the Indian Ocean. With a fleet reportedly comprising 317 ships
F_1_18 — Harappan Maritime Trade Networks
The Indus Valley (Harappan) Civilization (c. 3300–1300 BCE) operated one of the Bronze Age's most extensive maritime trade networks, connecting the Indus coast to Mesopotamia via intermediate ports in the Persian Gulf re
F_4_31 — Lapita Culture: Origins of Pacific Colonization
The Lapita cultural complex (c. 1500–500 BCE) represents the archaeological signature of the first human colonization of Remote Oceania — the islands beyond the Solomon chain that had never been inhabited by any hominid.
F_4_05 — Sea Peoples and Bronze Age Collapse
This document examines Sea Peoples and Bronze Age Collapse, a topic within the Lost Connections research area. Key areas of investigation include The Interconnected World of ~1400–1200 BCE, The Amarna Letters — Evidence
F_4_25 — Doggerland: Europe's Submerged Landscape
Doggerland is the name given to the now-submerged landmass that once connected Britain to continental Europe across what is now the southern North Sea. During the Last Glacial Maximum (~26,500–19,000 years ago), when sea
F_4_29 — Columbian Exchange: Biological & Cultural Transformation
The Columbian Exchange — a term coined by historian Alfred W. Crosby in 1972 — describes the massive bidirectional transfer of plants, animals, diseases, technologies, and peoples between the Americas and the Old World f
F_4_13 — Glass Production: Origins, Trade, and Technology Transfer
Glass is one of the earliest synthetic materials, with origins tracing to faience (glazed quartz) production in Egypt and Mesopotamia by ~5000 BCE and true glass beads appearing by ~3500 BCE. For over two millennia, glas
F_4_01 — Atlantis
Atlantis is the most famous lost-civilization tradition in the Western world — a powerful island empire described by Plato in two dialogues (~360 BCE) that was destroyed by the gods and "swallowed up by the sea" in a sin
F_3_05 — Writing System Origins and Independent Inventions
Writing was independently invented at least four times in human history: Sumerian cuneiform in Mesopotamia (~3400 BCE), Egyptian hieroglyphs (~3200 BCE), Chinese script (~1200 BCE with possible earlier precursors), and M
F_3_04 — Spread of Metallurgy: Copper, Bronze, Iron Across the Ancient World
Metallurgy developed independently in multiple regions, beginning with native copper use by ~9000 BCE and smelting by ~7000 BCE in Anatolia. The transition from copper to arsenical bronze and then tin bronze reshaped anc
F_3_12 — Ancient Quarantine and Disease Knowledge
Long before the development of germ theory (Pasteur and Koch, 1860s–1880s), ancient and medieval civilizations developed remarkably effective quarantine and disease containment practices based on empirical observation of
ZA_2_13 — Quantum Gravity Approaches
Quantum gravity is the unfinished quest to unify general relativity (GR) — which describes gravity as spacetime curvature at macroscopic scales — with quantum mechanics (QM), which governs microscopic physics. The challe
ZA_2_05 — Hawking Radiation and Black Hole Thermodynamics
In 1974, Stephen Hawking showed that black holes are not truly black — they emit thermal radiation at a temperature inversely proportional to their mass, implying that black holes slowly evaporate and eventually disappea
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