Transcription: So, where do we come from? You know, us, humans, human beings. Have we always been like we are now? And if we haven't, what were we before we became us? Well, you know what I mean. Right, the first thing to say is that we're putting together a jigsaw puzzle with most of the pieces missing. Also, it's very controversial, so each piece gets argued about over and over. Basically, there's two questions. First, what is our lineage? What evolutionary branch did mankind come up or off and what's not on our branch? So who are our closest relatives? The other question is very philosophical. When did no ...