Zelia Nuttall on “The Atlatl or Spear-Thrower of the Ancient Mexicans ... in the National Library at Florence, the complete evolution of the atlatl from the simple form used by the native ...

This view is further reinforced by Shea (1988), who researched similar spear points from the Middle ... The post The ...

grabbing a spear and growing taller to become a modern human. This diagram called 'The March of Progress' simplifies evolution into a series of stages which took place over millions of years.