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They invented the spoked wheel which is another reason they could travel so fast. Their carts were lighter and could travel much faster. Wheels had already been around but were a solid wooden disks which meant they were so heavy that they could only be pulled by oxen and consequently slow.

Yamnaya were some of the first people to have lactose tolerance into adulthood. It's how they were able to spread so fast, they were able to consume dairy which of course included horses’ milk.

They were at least a head or two heads taller than everyone they met on their way to E Europe and terrified the people there. Also, they arrived on horseback, which was something entirely unseen to that point and was also frightening.

They were semi nomadic and where they built structures ... each ‘long house’ was connected to the next, each had its own well and each dwelling had a forge where bronze weapons and implements were routinely forged. Amazing!

Great information is at: https://www.youtube.com/watch?v=d48bhkOiEuA

and ... https://www.youtube.com/watch?v=uzmwCZlobio

His name is Tom Rowsall (sp?) and woke jerks hate him