1.   The slopes of Olduvai Gorge are littered with thousands of primitive stone tools.

2.   Man owes his existence to the maker of those primitive stone tools, who planted the seed of the human career.

3.   He also has shown tool-making ability -- hitting two stones together to make primitive tools the way early human ancestors did, Savage- Rumbaugh says.

4.   King had gone to the Uptar site to examine Russian collections of prehistoric artifacts to study changes in primitive tool technologies.

5.   Later, primitive tool makers lashed the stone head, or celt, onto a wooden handle.

6.   Now he has sketched a credible portrait of a world unimaginable, where agile mammals with primitive tools battle ancient mammals with terrifying instincts.

7.   Some of the displays of primitive tools, pottery, and human skeletal remains reach back thousands of years to the Paleolithic, Mesolithic, and Neolithic Ages.

8.   Take four ancient sites that have puzzled archeologists for generations and try to replicate their construction using primitive tools.

9.   The earliest known sites were identified because they were covered in deliberately flaked stones, which could be recognized as primitive tools.

10.   We walked past primitive tools, antique stationary bicycles and a stack of old Monopoly games.