"තාක්‍ෂණය" හි සංශෝධන අතර වෙනස්කම්

 

==== Stone tools ====

[[ගොනුව:Clovis Point.jpg|upright|thumb|A [[Clovis point]], made via [[Lithic reduction#Pressure flaking|pressure flaking]]]]

Human ancestors have been using stone and other tools since long before the emergence of ''[[Homo sapiens]]'' approximately 200,000 years ago.<ref>{{cite web | url=http://anthropology.si.edu/humanorigins/ha/sap.htm | title=Human Ancestors Hall: Homo sapiens | accessdate=2007-12-08 | publisher=[[Smithsonian Institution]] }}</ref> The earliest methods of [[stone tool]] making, known as the [[Oldowan]] "industry", date back to at least 2.3 million years ago,<ref>{{cite web | url=http://news.bbc.co.uk/1/hi/sci/tech/336555.stm | title=Ancient 'tool factory' uncovered | accessdate=2007-02-18 | publisher=[[BBC News]] | date=1999-05-06}}</ref> with the earliest direct evidence of tool usage found in [[Ethiopia]] within the [[Great Rift Valley]], dating back to 2.5 million years ago.<ref>{{cite journal | title=Environment and Behavior of 2.5-Million-Year-Old Bouri Hominids | last=Heinzelin | first=Jean de | journal=[[Science (journal)|Science]] | month=April | year=1999 | volume=284 | issue=5414 | pages=625–629 | doi= 10.1126/science.284.5414.625 | pmid=10213682}}</ref> This era of stone tool use is called the ''[[Paleolithic]]'', or "Old stone age", and spans all of human history up to the development of [[agriculture]] approximately 12,000 years ago.