Assertion: human's tool | /r/HasProperty | sharp-edged stones
Facets:
value: probably
type: DEGREE
Source sentences:
text: Precisely when early humans started to use tools is difficult to determine, because the more primitive these tools are (for example, sharp-edged stones) the more difficult it is to decide whether they are natural objects or human artifacts.
text: Probably the most important tools in the Oldowan tradition were sharp-edged stone flakes produced in the process of making the core tools.