Ancient DNA traces the history of hepatitis B Hepatitis B virus (HBV) infections represent a worldwide human health concern. To study the history of this pathogen, Kocher et al . identified 137 human remains with detectable levels of virus dating between 400 and 10,000 years ago. Sequencing and analyses of these ancient viruses suggested a common ancestor between 12,000 and 20,000 years ago. There is no evidence indicating that HBV was present in the earliest humans as they spread out of Africa; however, HBV was likely present in human populations before farming. Furthermore, the virus was present in the Americas by about 9000 years ago, representing a lineage sister to the viral strains found in Eurasia that diverged about 20,000 years ago. —LMZ

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The study focuses on the analysis of Middle Neolithic burial complexes of the Baikal-Yenisey Siberia. Based on a series of reliable radiocarbon dates, their age lies within the range of 6190–5900 cal BP. It partly corresponds to the end of the hiatus in the mortuary traditions of Cis-Baikal. Features of the burial rite and funerary offerings are analyzed and compared with those of neighboring territories. One of the most frequent images in the art of the Middle Neolithic Baikal-Yenisey Siberia is that of the waterfowl, rendered as fi gurines. The common grave goods are leaf-shaped stone arrowheads, shell beads, and pendants made of animal bones and teeth. The funerary rite included the use of fi re and reddish mineral pigment, as well as disrupting the anatomical integrity of the skeletons, possibly due to partial burial (the data are tentative). Most burials of the late stage of the hiatus are evidently those of hunter-gatherers manufacturing the Ust-Belaya ceramics, which were found in certain burials. A bone arrowhead with a biconical point and fi gurines representing waterfowl suggest cultural ties with the Urals and Western Siberia; but their nature has yet to be clarifi ed, which requires large-scale AMS-dating and paleogenetic analysis.