Researchers have unearthed stone tools that date back to at least 3. ... uncovered the remains of ancient human ancestors ...

boisei walked upright. Homo habilis, which actually means "handy man," is apparently the first species to make and use primitive stone tools. About five feet tall and weighing 100 pounds ...

Homo habilis was an individual whose larger ... They were able to develop the technology of stone tools…they were the first ones to move out of trees and walk upright…and they were the first ...

Researchers have unearthed stone tools that date back to at least 3. ... uncovered the remains of ancient human ancestors such as Homo habilis, Homo erectus and prehistoric Homo sapiens, or modern ...