first stop the place where it all began the birthplace of every human being alive Africa the Kalahari Desert Namibia I'm here to find an extraordinary ancient tribe of people the son Bushman our research shows that their distant relatives left Africa and set in motion the family tree of mankind from them stemmed every color creed and nationality alive today 50,000 years on I hear their numbers are dwindling fast soon they could be gone entirely I'm arriving not a moment too soon hello I'm Spencer and my two children they are boys this is my wife the first thing I noticed was their incredible language they speak with clicks and other sounds totally alien to me and the word for Zer they try to teach it to me and for two and three and four I can't get that for is this strange language a window on the past did our ancestors speak like [Music] them there's a reasonable hypothesis that these clicks are in fact ancestral sounds which have been lost in all of the other uh world's languages probably lost just once in Africa and then the group which lost these clicks left Africa and spread throughout the entire world of course SP I just want to tell you a little bit about why I've come here um it's mostly to find out about your way of life I'm I'm really excited to be here you know it's it's such a dream for me to get to meet the sun people the Bushmen in a way you carry a secret in your blood and you can think about it like a family tree I explained the tree was just like the family that we all belong to my family line is one of the small fractured branches at the very top while theirs is the oldest on Earth the biggest Branch at the base of the trunk I get the feeling I'm not explaining this at all well but they're way too polite to say so this is really quite embarrassing so it's a great privilege for me to come and meet my distant relatives and the people who give us a glimpse of all of our ancestors so in one sense we're all Co son we're all Sun people it's just that my skin is slightly redder like to thank you for the information that you brought for us 50,000 years ago click was a new and complex language there' been nothing like it before but there were other Innovations too they showed me this it's a spear tip finely crafted from bone it might not seem like much today but when our ancestors started using it it was the last word in technology the smart missile of its day interesting so they didn't use Stone no they didn't use Stone they used the bone the bone because it's more efficient the arrows refiner and yeah now we're getting somewhere when they left Africa 50,000 years ago the ancestors of these new age people had state-of-the-art hunting technology and a brand new language to communicate ideas 50,000 years ago this kind of thinking would have given them an immense advantage over their competitors anyone who couldn't think like this no if you look on the edge of the track over here it's still it's got a very very sharp edge and that's basically their main thing working saying okay the age of the track and then they'll take another and how precise can they be mean to within hours yeah wow