5.0

If books are time machines then I believe this is the furthest back I have ever cast my mind for any length of time. Covers the neolithic Eurasia through to the bronze age, arguing that Proto-Indo-European was such a successful language not simply because of warfare but because it was capable of 'franchising,' in a way, by showing off to the world through ritual feasts how they had better technologies and customs.

I did a big thread of the most fascinating bits, and there are many, here.