wooden levers Wooden beams are put into excisions and then watered. The beams swell and break the stone. Hard stone could only be cut with other hard stones. Drilling tools are already used from the ...

The general method seems to have been to take a block of stone with a preliminary drawing of the objects to be cut. Stone tools seem to have been used for cutting the block, while details were cut ...

Research Reveals Chimpanzee’s Stone Tool Choices Mirror How Ancient Human Ancestors Used Them Researchers have noted a stark ...

They used rocks as choppers, scrapers and simple cutting implements ... when choosing stones for use as tools. More information: D.R. Braun et al, Stone selection by wild chimpanzees shares ...