I came across this bit: >As reported in Science in Poland, the research team explained that it was a time of increasing unrest related to the penetration into Central and Eastern Europe of groups of nomads from the Pontic Steppe. Local communities found themselves on the threshold of sudden changes. To postpone the rapid changes associated with the appearance of new neighbors, locals began to practice various rituals, including sacrifices. This is pure bullshit. They pulled this out of their asses. There is no way to know that this was true, or even any reason to suspect it was true. They started to practice sacrifices because they were facing sudden social changes? WTF? No one can know that. I mention this only to show people that 95% of archaeology is speculative and impossible to prove.