“Because the people across southern Africa all chose to make the tools look the same, it indicates they must have been socially connected...”
Or they had one guy hawking his tools and he moved around a lot. “Get yer red hot Swiss Army Knife here!” and evidently he belonged to the Swiss Army, (or at least stole their idea for a knife) which was really unusual because up until now we thought Switzerland didn’t exist till
the middle ages, 1291 they say.
Heh, it’s not that farfetched. Could also be due to very long trade routes, including seagoing trade routes. If the trade wasn’t seagoing, it wasn’t getting to Australia.