Periods of migration are the worst moments to look for natural selection, not the best, because they drown the signal in huge frequency swings.

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• 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
• Adaptation accounts for only about 2% of the change in human gene frequencies; the other 98% is migration, mixture and drift. 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
• Finding no selection in African-Americans over 300 years is not evidence against selection: five generations is simply too short a time to compound. DRDavid Reich8 May 2026similar wording
• The weak selection signal on behavioural traits is a shortage of statistical power, not evidence that behaviour was unselected. DRDavid Reich8 May 2026similar wording

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