Gift Economy
Wikipedia:
A gift economy is an economic system in which goods and services are given without any explicit agreement for immediate or future quid pro quo.
NativeWiki
Link:
NativeWiki is a new project of NativeWeb to allow users to contribute information on Indigenous peoples around the world
Aquatic Ape Hypothesis
Wikipedia:
The aquatic ape hypothesis (sometimes called the aquatic ape theory) proposes that the ancestors of humans went through one or more periods of time living in a semi-aquatic setting and that this history accounts for many of the characteristics of species