One of the earliest inventions, the spear-thrower, enhanced that ability even more, giving us the ability to kill big game from a distance with near impunity. (

One of the earliest inventions, the spear-thrower, enhanced that ability even more, giving us the ability to kill big game from a distance with near impunity. (It works by increasing the lever arm. Think of a lacrosse stick.) http://en.wikipedia.org/wiki/Spear-thrower http://en.wikipedia.org/wiki/Spear-thrower