[Rebelbase]

Couldn’t they have walked halfway and traded for the tools from someone else who got them from someone who walked the other half?

[SunkenCiv]

Sure, maybe they arranged the meeting using text messaging.

[gleeaikin]

They probably traveled hundreds of miles in a generation, and then the next one did the same, all the time making the same tools handed down father to son. Eventuaally they got there.