A reader pointed out that the BBC series The Incredible Human Journey is online on YouTube thanks to the WhyEvolutionIsTrue channel. You can find all the episodes here. I've embedded episode 1 below. For what it's worth I am no longer am confident that we should start these sorts of narratives like the presenter does, by suggesting that "a handful of African families could become a whole world of people." I suspect that the emergence of modern humans is not so neat & tidy.