Walk in the Glow of Each Other's Majestic Presence

I cannot recall whether it was a Ted Talk or an article on NPR or a book I read that talked about the theory about how we (homo sapiens) were able to evolve and survive versus our near-cousins (who were homo somethingelse) which involved the development of the ability to speak. It's far down in the memory cells that half-heimer's has eaten but if I recall, it went something like this: Behaviorally, we (as a species) tend to be much like the gorillas and other monkey clans who maintain small tribes which often communicate with social behaviors of touching. And the spending of time touching becomes part of the bonding exercises that keep the pack together. At some point the pack becomes too large to touch with significant time. This keeps the packs to a certain maximum size. This is where language comes into play. We can talk and communicate further than we touch. By communicating like this, we can reach out to others and our packs can become larger. We create "societies" where we share time and energy in larger tribes.