David Reich
Population geneticist; ancient DNA
“multiple analyses, we do suggest that the genome is vibrating with natural selection, and there's all sorts of weaker effects that are there that would be picked up in larger studies even than we've done. And that in fact, almost every position in the DNA is correlated to a position, and being dragged in one way or the other by natural selection instead of being quiescent. Natural selection is everywhere. Even though it's only 2% of the frequency change, it's tugging the positions in one direction or the other everywhere.”
“we could compare the last 5,000 years of our time period, what's called the Bronze Age, and further onward to the previous 5,000 years. And what we see is that this intensification of selection around immune traits, similarly the intensification around metabolic traits has accelerated over this time period.”
“There's a known interbreeding event from the lineage leading to modern humans into Neanderthals. But it's supposed to be only 5%, so I'm interested in that. 5% is actually a sign of something much more impactful, that is that somehow Neanderthals are in some sense deeply modern in some ways. And Even though they get swamped by archaic genes, that somehow they're actually have more of a modern impact than one would think”
David Reich
One-line summary: Podcast / speaker: Harvard/ancient-DNA geneticist arguing recent human selection is not quiescent and that many frequency trajectories intensify in the Bronze Age. Claims are interview chips, not paper citations.
What they're known for
Population geneticist working with ancient DNA. On this podcast he argues that large sample sizes now show recent selection “vibrating” across the genome, with a pulse of immune/metabolic change he dates to the Bronze Age rather than first farming. Interview chips, not a filed paper.
Why they matter to science
First biology / ancient-genomics speaker in the science thread, and a Bronze Age bodies claim for history that must not be merged with the wiki’s Late Bronze Age collapse pages.
Said
Speaker-attributed claims extracted from diarized sources. Each bullet mirrors one entry in quotes: frontmatter — keep them in sync.
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On recent-human-selection-not-quiescent:
"multiple analyses, we do suggest that the genome is vibrating with natural selection, and there's all sorts of weaker effects that are there that would be picked up in larger studies even than we've done. And that in fact, almost every position in the DNA is correlated to a position, and being dragged in one way or the other by natural selection instead of being quiescent. Natural selection is everywhere. Even though it's only 2% of the frequency change, it's tugging the positions in one direction or the other everywhere." — 2026-05-08-podcast-dwarkesh-podcast-david-reich-why-the-bronze-age-was-an (2026-05-08)
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On bronze-age-selection-pulse:
"we could compare the last 5,000 years of our time period, what's called the Bronze Age, and further onward to the previous 5,000 years. And what we see is that this intensification of selection around immune traits, similarly the intensification around metabolic traits has accelerated over this time period." — 2026-05-08-podcast-dwarkesh-podcast-david-reich-why-the-bronze-age-was-an (2026-05-08)
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On neanderthals-as-swamped-modern-humans:
"There's a known interbreeding event from the lineage leading to modern humans into Neanderthals. But it's supposed to be only 5%, so I'm interested in that. 5% is actually a sign of something much more impactful, that is that somehow Neanderthals are in some sense deeply modern in some ways. And Even though they get swamped by archaic genes, that somehow they're actually have more of a modern impact than one would think" — 2026-05-08-podcast-dwarkesh-podcast-david-reich-why-the-bronze-age-was-an (2026-05-08)