Adaptation accounts for only about 2% of the change in human gene frequencies; the other 98% is migration, mixture and drift.

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• Population size is not what limited human adaptation; time is. A selection coefficient of half a percent works as well in a thousand people as in a million. DRDavid Reich8 May 2026similar wording
• Natural selection in humans has not been quiescent: it is tugging almost every position in the genome in one direction or another, everywhere. DRDavid Reich8 May 2026similar wording
• Periods of migration are the worst moments to look for natural selection, not the best, because they drown the signal in huge frequency swings. DRDavid Reich8 May 2026similar wording
• The selection signal on the genetics of schooling is not a European artefact: the same variants predict years of school in China, a population disconnected from Europe for the whole period. DRDavid Reich8 May 2026similar wording
• Reproductive incompatibility between diverging human lineages grows roughly as the square of their separation time, because it takes pairs of interacting genes. DRDavid Reich8 May 2026similar wording

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