Carrying weight on the head is a primal activity, something we have done for millions of years.
Transporting water in the Ouahigouya marketplace, Burkina Faso, 1998.
I took an archeology course at Stanford from professor John Rick that included a workshop on stone knapping (chipping away at a stone to create arrowheads and similar tools). While most of us created pitiful arrowheads with no chance of any hunting success, a few members of the class hit the obsidian at productive angles that resulted in decent weapons. Professor Rick says that about 10 percent of his students intuitively know how to make good arrowheads. He believes that the relevant DNA for being good at this task has been conserved through the generations in these individuals. Making stone tools like... Read more