They lived near rivers and coasts, right?Any evidence that people back then were too stupid to build smart phones when they were able to survive horrendous weather and that's why we're here?Any evidence that people back then were too stupid too build ships when they were able to survive horrendous weather and that's why we're here?
They were just as smart as we are but there is no evidence they possessed the technology for either. Do you have evidence to the contrary?