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.
2,508 results for "CA" — page 92 of 126
ZD_2_01 — Machine Learning Mathematics
Machine learning — the science of algorithms that improve through experience — rests on a rich mathematical foundation spanning optimization, statistics, linear algebra, probability, and functional analysis. The core mat
L_1_01 — Ancient DNA & Population Genetics
Modern paleogenomics has shown that human evolution was shaped by interbreeding, population structure, and repeated demographic turnover rather than a simple single-line progression. Ancient DNA revealed previously unkno
L_1_06 — Human Migration Synthesis — DNA, Language, and Culture
The synthesis of genetic, linguistic, and archaeological evidence has transformed understanding of human migration over the past three decades.
L_1_04 — Archaic Human Species Synthesis
The human evolutionary tree is far more complex than the older linear model suggested. Fossils, ancient DNA, and proteomics now show that Homo sapiens overlapped with several other hominin lineages, including Neanderthal
L_1_09 — Ghost Populations & Missing Archaic Lineages
Ghost populations are human groups whose existence is inferred from statistical signatures in modern or ancient genomes rather than from direct fossil or archaeological evidence. The term reflects a central challenge of
L_1_14 — Homo Erectus: The Most Successful Human Species
Homo erectus (including regional variants sometimes classified as H. ergaster, H. georgicus, H. soloensis, and H. pekinensis) is arguably the most successful hominin species in evolutionary history — persisting for nearl
L_1_03 — Mitochondrial Eve, Y-Chromosomal Adam & Population Origins
Mitochondrial Eve and Y-chromosomal Adam are the most recent common ancestors of all living humans along strictly maternal and strictly paternal lines. They were not the first woman and man, were not a couple, and do not
L_1_11 — Convergent Genetic Evolution — Same Solutions, Different Lineages
Convergent evolution — the independent evolution of similar features in species from different evolutionary lineages — is one of the most powerful demonstrations of natural selection's predictability and one of the deepe
L_1_08 — Denisovans — Archaic Hominin Deep Dive
Denisovans are an extinct group of archaic hominins identified primarily through ancient DNA analysis rather than traditional fossil morphology — making them history's first hominins to be discovered by genetics. In 2010
L_1_12 — Ghost DNA: Unknown Archaic Hominin Admixture
"Ghost DNA" refers to genetic signals — segments of the genome, deviations in allele frequency distributions, or anomalous phylogenetic patterns — that indicate admixture (interbreeding) between anatomically modern human
L_1_16 — Denisovan Genetics and Legacy
The Denisovans — an extinct group of archaic humans first identified in 2010 from ancient DNA extracted from a finger bone fragment found in Denisova Cave, Altai Mountains, Siberia (~41,000 years old) — represent one of
L_4_05 — Paleogenomics Methods and Ancient DNA
Paleogenomics — the study of ancient genomes — has transformed archaeology, anthropology, and evolutionary biology over the past two decades, recognized by the 2022 Nobel Prize in Physiology or Medicine awarded to Svante
L_4_04 — Ancient Proteomics and Paleoproteomics
Paleoproteomics — the recovery and analysis of ancient proteins from archaeological and paleontological specimens — has emerged as a revolutionary complement to ancient DNA (aDNA), dramatically extending the temporal and
L_4_06 — Epigenetics and Transgenerational Inheritance
Epigenetics — the study of heritable changes in gene expression that occur without alterations to the DNA sequence itself — has transformed modern biology by revealing a layer of regulatory information "above" the genome
L_4_03 — Genetic Clocks and Molecular Dating
The molecular clock — the concept that DNA and protein sequences accumulate mutations at approximately regular rates over time — provides a powerful tool for dating evolutionary divergences independently of the fossil re
L_4_17 — Transgenerational Epigenetic Trauma
Transgenerational epigenetic inheritance of trauma — the hypothesis that severe stress, famine, or psychological trauma experienced by one generation can alter the epigenetic marks (DNA methylation, histone modifications
L_4_01 — Ancient DNA from Sediment — Environmental DNA Revolution
Environmental DNA (eDNA) recovery from sediments has revolutionized our ability to detect the presence of organisms — including ancient humans — without requiring the discovery of any bones, teeth, or artifacts. The land
L_4_09 — Selective Sweeps and Positive Selection in Humans
A selective sweep occurs when a beneficial allele rises rapidly in frequency under positive natural selection, carrying nearby linked variants along with it (genetic hitchhiking) and reducing genetic variation across the
L_4_12 — CRISPR Gene Drives and Population Genetics Ethics
CRISPR gene drives — genetic engineering systems that combine CRISPR-Cas9 gene editing with super-Mendelian inheritance to spread a modified gene through an entire wild population far faster than natural selection — repr
L_4_08 — Genetic Genealogy and Forensic Genomics
Genetic genealogy — the use of DNA testing for genealogical purposes — has undergone an explosive expansion since the early 2000s, driven by direct-to-consumer (DTC) genetic testing companies (23andMe, AncestryDNA, MyHer
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