This topic will be a place to discuss the ancient sole-genetic progenitor Adam. This includes models put forward by @vjtorley and @Agauger.
The first story is the most technical, and it is about sole- genetic progenitorship (discussion). If Adam and Eve were more ancient than 500-700 thousand years ago, they could have been our sole- genetic progenitors. This would mean all “humans” would descend directly from Adam and Eve, and their offspring never interbred with others.
The Three Stories are discussed separately on these threads: