11.   Archeologists have examined patterns in early stone tools for clues to when humans might have developed the creativity and the self-awareness usually associated with communication skills like speech.

12.   Armed with fire, stone tools and weapons, those ancestors soon began spreading throughout much of Europe and Asia, even into Indonesia.

13.   As everywhere else in the world, the eastern Asian archaeological record reveals only the debris of hunter-gatherers using unpolished stone tools.

14.   As trash was ultimately hauled out, stone tools and mammal bones were found in the cavelike dwellings.

15.   As surprising as the antiquity of the bones are the stone tools.

16.   At caves in Israel anthropologists have also found Neanderthal bones with stone tools like those of the more modern sapiens.

17.   At that time in Europe, Neanderthals were still hacking away at reindeer carcasses with their flaked stone tools.

18.   At the site of an ancient Anasazi settlement near Mesa Verde in southwestern Colorado, archaeologists came upon butchered human bones and stone cutting tools stained with human blood.

19.   Beginning in the fourth or fifth millennium B.C., pottery and stone tools of unmistakably southern Chinese origins appear on the island of Taiwan.

20.   Boxes are all over the floor, crammed with fragments of stone tools and weapons, charred seeds, animal bones and other raw material she has analyzed.