Was the bow and arrow an invention that was universally disseminated among humans? I cannot, off the top of my head, think of any area of the world where the bow and arrow was not used. Was it repeatedly invented in different places, or is this an invention so old it radiated with human-kind out of Africa? I guess it could have been invented after man had dispersed from the Rift Valley and been disseminated subsequently, but it would have need to have been done before the Americas became isolated from Eurasia. Something like 20,000 BC, I think?
