https://www.sciencemag.org/news/2020/02/mysterious-ghost-populations-had-multiple-trysts-human-ancestors?utm_source=newsfromscience%3Dflipboard%3Dflipboard2451810
https://www.sciencemag.org/news/2020/02/mysterious-ghost-populations-had-multiple-trysts-human-ancestors?utm_source=newsfromscience%3Dflipboard%3Dflipboard2451810