Is the steppe migration theory of Indo-European origins correct after all?

Genetic study challenges Anatolian farmer hypothesis

One of the longest-running debates in the study of prehistory is the origin of the Indo-European language family. This group includes languages spoken from Great Britain and Ireland to India the steppes of Central Asia, and a connection between them was established as far back as the late eighteenth century. It is assumed that all originated from a single mother tongue, Proto-Indo-European (PIE), but where was PIE spoken?
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