==== the evolution of cultures ====

“Civilization advances by extending the number of important operations which we can perform without thinking of them.” -- Alfred North Whitehead

links
  * http://www.vub.ac.be/CLEA/liane/MAV/mav.htm
  * http://www.cpm.mmu.ac.uk/jom-emit/1997/vol1/gabora_l.html