I don't see anything that people here shouldn't already have heard.

See:
https://www.cambridge.org/core/journ...rfJt5w.twitter

"What facilitated this major demographic event remains open to speculation, but the late fourth millennium BC was a period of widespread technological innovation, which also introduced long-distance travel. This horizon could thus have formed a prelude to the Yamnaya migrations, opening up new corridors of cultural transmission on which subsequent developments depended (Johannsen & Laursen 2010; Hansen 2011, 2014). Moreover, a decline in Neolithic activity around 3000 BC (Hinz et al.2012; Shennan et al.2013) could indicate a crisis in Neolithic societies, thereby allowing space for incoming migrants. In that light, the recent documentation of an early form of plague, widespread from Siberia to the Baltic in the early third millennium BC, could play a key role in explaining this genetic changeover (Rasmussen et al. 2015)."

These extensive demographic changes led to the formation of a new social and economic order in large parts of temperate Europe, resulting in the formation of the Corded Ware Culture. As evident from, for example, western Jutland (Andersen 1993; Kristiansen 2007), Corded Ware people burned down forests on a massive scale, thereby creating open, steppe-like grazing lands for their herds. A more gradual opening of the landscape is also found in other regions (Doppler et al. 2015), while subsistence seems to have been a variable mix of cultivation, husbandry and some hunting and gathering (Müller et al. 2009).

"Secondly, we should observe that Corded Ware Cultures co-existed with late Neolithic cultures for shorter or longer periods across much of Central and Northern Europe. In Denmark, there were late Funnel Beaker communities in the Danish islands (Iversen 2015); in other parts of Northern Europe they were often in close proximity, such as the Globular Amphora Culture in Poland (Szmyt 1999). What we observe, therefore, in the archaeological record is a gradual process of acculturation and integration, which meant that after 2400 BC, the former strict cultural boundaries were gradually dissolved and a new, shared material culture appeared, represented first and foremost in Denmark by flint daggers, and in Central Europe by early Únetiče metal daggers. Bell Beaker groups had by now also emerged on the scene, introducing metallurgy, and they further complicated the mix of cultures and people. In burial rituals, however, old megalithic traditions still had an impact, as seen in a revival of stone cist burial in some regions. It was only on the advent of the Middle Bronze Age that cultural homogenisation prevailed. Thus, it took nearly 1000 years before all regions in Northern and Central Europe had adopted a shared social and cultural outlook that in all probability also included shared languages."

"We may also note that pastoral economies historically tend to dominate agrarian economies, as they are both more mobile and more warlike in their behaviour. Such a pattern of economic and social dominance, reflected in taking wives from farming cultures while sending young males in organised war-bands to settle in new territories, would explain both the genetic and linguistic dominance of the Yamnaya steppe migrations, the results of which we can observe to this day. Figure 1 summarises these transformative processes in a model."

It's just like the Semites.

One of the rituals practiced by these boy gangs is that at initiation they had to kill a dog they had raised and trained. I wonder if that's where the SS got the idea.

The authors make this sound so antiseptic. The reality was probably catastrophic and traumatic.