Behavior: Lost Tribe of the Tasaday

In most areas of the earth, the Stone Age came to an end thousands of years ago, but not in the remote mountain forests of the Philippine island of Mindanao, 650 miles south of Manila. There, scientists recently discovered a lost tribe of Stone Age human beings whose way of life has remained unchanged for aeons. Excited by their unique opportunity, Philippine anthropologists last week prepared for an expedition into the jungle to live with the tribesmen and investigate their customs before the primitive culture is contaminated or obliterated by encroaching civilization.

The...