I would have thought that the origin of "self" vs. "other" could essentially be traced back to the first infant who looked up from its mother's breast and realized that baby and mother were not the same.

But to show you how truly ignorant I am, I would not have characterized the Ice Age as relatively recent. Where exactly did it fall in the development of humankind?

Peace.

~ ~ ~
All meetings end in separation
All acquisition ends in dispersion
All life ends in death
- The Buddha

|\_/|
='_'=

Every hundred years, all new people