L_2_15 — Population Structure of the Ancient Near East: Farming Spread Genetics

The Neolithic Revolution — the independent invention of agriculture in the Fertile Crescent (~10,000-8,000 BCE) — was one of the most consequential transformations in human history, and ancient DNA has revealed that the

L_2_18 — Archaic Admixture in Africa (Ghost Populations)

While Neanderthal and Denisovan admixture in non-African populations has been well-documented since Svante Pääbo's landmark 2010 Neanderthal genome paper, evidence for archaic admixture within Africa represents a more re

L_3_16 — Genomic Imprinting & Evolutionary Conflict

Genomic imprinting — the epigenetic phenomenon in which a subset of genes (~100–200 in mammals) are expressed from only one parental allele, with the other allele silenced by DNA methylation and histone modification esta

L_3_06 — Genetics of Intelligence and Cognition

The genetics of intelligence — one of the most studied yet contentious areas in behavioral genetics — has established that cognitive ability, as measured by standardized tests, has a substantial heritable component (~50–

L_3_17 — Endogenous Retroviruses (HERVs) in the Human Genome

Human endogenous retroviruses (HERVs) — remnants of ancient retroviral infections that integrated into the germline DNA of human ancestors and have been vertically transmitted through the host genome for millions of year

L_3_09 — HLA Diversity and Immune System Evolution

The Human Leukocyte Antigen (HLA) system — the human version of the Major Histocompatibility Complex (MHC) found in all jawed vertebrates — is the most polymorphic gene region in the entire human genome. Located on chrom

L_3_00 — Adaptation Traits: Subfolder Summary

L_3_18 — Horizontal Gene Transfer in Eukaryotes

Horizontal gene transfer (HGT) — the movement of genetic material between organisms through mechanisms other than vertical parent-to-offspring inheritance — was long considered a predominantly prokaryotic phenomenon, cen

L_3_03 — Lactase Persistence and Gene-Culture Coevolution

Lactase persistence — the ability of adults to digest the milk sugar lactose — is the most thoroughly documented case of gene-culture coevolution in the human species. The ancestral mammalian condition is lactase non-per

L_3_08 — Genetics of Skin, Hair, and Eye Color

Human pigmentation — skin, hair, and eye color — is one of the best-understood complex traits in human genetics, with a relatively modest number of genes explaining a large proportion of variation compared to most polyge

L_5_10 — Neandertal Introgression: Which Genes and Why They Persisted

When modern humans (Homo sapiens) migrated out of Africa ~60,000-70,000 years ago and encountered Neanderthals (Homo neanderthalensis) in western Asia and Europe, the two species interbred — and the genetic legacy of tha

L_5_03 — Pharmacogenomics and Ancestral Medicine

Pharmacogenomics — the study of how genetic variation influences individual responses to drugs — bridges genetics, pharmacology, and clinical medicine. Humans carry extensive polymorphism in genes encoding drug-metaboliz

L_5_16 — Archaeogenetics: Ancient DNA and the Human Past

Archaeogenetics — the extraction and analysis of DNA from ancient human, animal, and plant remains — has transformed our understanding of human history since the field's breakthrough in 2010. Advances in next-generation

L_5_08 — Ancient DNA from Sediments: Cave Dirt Genomics

One of the most revolutionary methodological advances in ancient DNA (aDNA) research has been the recovery of hominin DNA directly from cave sediments — without any bones or teeth. This technique, pioneered by Matthias M

L_5_00 — Health Microbiome Applied: Subfolder Summary

L_5_02 — Genetic Diseases and Founder Effect Populations

When a small group founds a new population and subsequently expands in relative isolation, genetic drift can amplify alleles that were rare in the ancestral population — including deleterious recessive disease alleles. T

Y_4_08 — Sleep Science — REM, NREM, and the Ancient Understanding of Sleep

Sleep science has undergone a revolution in the 21st century, fundamentally altering our understanding of why humans sleep. The landmark 2012 discovery of the glymphatic system by Maiken Nedergaard revealed that the brai

Y_4_06 — Synesthesia and Cross-Modal Perception

Synesthesia — the involuntary, consistent experience of one sensory modality triggering perception in another (e.g., hearing colors, tasting shapes) — affects roughly 4% of the general population when broad subtype defin

Y_4_02 — Savant Syndrome and Acquired Genius

Savant syndrome — extraordinary ability coexisting with significant cognitive disability — affects roughly 1 in 10 people with autism and ~1 in 2,000 people with other developmental disabilities or brain injuries. What m

Y_4_17 — Sleep Disorders & Parasomnias

Sleep disorders affect an estimated 50–70 million Americans and up to 45% of the global population, encompassing over 80 distinct conditions classified by the International Classification of Sleep Disorders (ICSD-3, 2014