In each of these cases, the discovery came from the analysis of physical remains from individuals who had no clearly identified modern descendants as a standalone population.

The modern genetic landscape had smoothed over and absorbed these ancient populations into the mosaic of contemporary human diversity, making them invisible to analyses based solely on modern genomes.

Ancient DNA cuts through this smoothing.

It provides snapshots — imperfect, incomplete, but real — of the genetic landscape at specific moments in the past, revealing populations that the modern world has absorbed but not erased.

The Ancient North Siberians fit this pattern exactly.