An interesting ongoing web project, Prehistoric loan relations, on potential loans of Proto-Indo-European words, from Uralic-Yukaghir, Caucasian, and Middle Eastern influence.
Based on a Ph.D. thesis by Bjørn (2017) Foreign elements in the Proto-Indo-European vocabulary (PDF).
From the website (emphasis mine):
This page allows historical linguists to compare and scrutinize proposed prehistoric lexical borrowings from the perspective of Proto-Indo-European. The first entries are all (135 in total) extracted from my master’s thesis “Foreign elements in the Proto-Indo-European vocabulary” (Bjørn 2017). Comments are encouraged at the bottom of each entry. New entries will be added, also on request.
Take this not as the conclusion, but an invitation to join the conversation.
So, we welcome the invitation, and hope that this new project thrives.
Also, I loved his fantasy-like map of the central Eurasian region (featured image on this post).