There probably isn't a normal human being who hasn't ask, "Where did we come from?" The following videos do an excellent job of explaining the probable history of how all life and humans began, and the history of human biological and cultural evolution. Oh, if you ask "Why?", that is a philosophical or religious question for which NO answer is justified no matter how intently apologists try to do so.
Where did life come from?
What was the ancestor of everything?
Why are we the only humans left?
Are we all related?
The Two People We're All Related To
From the fall of Dinos to the Rise of Humans
The Humans That Lived Before Us
When We First Walked
When humans were prey
When We Tamed Fire
When We Met Other Human Species
When we took over the world
