Ancient DNA and the new science of the human past (a lecture by David Reich):

Beginning in 2010, it became practical to sequence whole genomes extracted from DNA extracted from ancient human bones, and to analyze the data to understand changes in biology over time. Since then, the amount of ancient DNA data has increased at an extraordinary rate (...) Dr. Reich will begin his lecture by describing how present-day Europeans derive from a fusion of highly divergent ancestral populations as different from each other as are Europeans and East Asians. He will then summarize the history of modern humans in Europe over the approximately 45,000 years since they first arrived. (...)