stone tools

• what developments of stone tools were dated back 2.5million years ago?


  stone has been worked to be made into a cutting tool
• what developments of stone tools were dated back to 1.7million years ago?


  stone has been worked more carefully into a cutting tool
• what development of stone tools were dated back to 0.2million years ago?

  stone has been worked more carefully and precisely into a cutting tool, showing change in hand size and brain size