Can Progress be Attributed to Exchange and Specialization?

Somewhere in Africa more than 100,000 years ago, a phenomenon new to the planet was born. A Species began to add to its habits, generation by generation, without (much) changing its genes. What made this possible was exchange, the swapping of things and services between individuals. That gave the Species an external, collective intelligence . . . → Read More: Can Progress be Attributed to Exchange and Specialization?