Great Series On National Geographic Channel

Been watching "How the Earth Changed History" for the past two nights and it is awesome! It concludes tomorrow night and will repeat on the weekend.  So far I have learned about how water stored underneath the desert sands led to civilisations in the Sahara setting up camp, how the Nile river's silt travels from the volcanic mountains in Ethiopia to Eygpt and that is why they have such fertile land and how the Wind effectively helped turned the gold trade to slavery in Ghana and how it affected colonisation and trade around the world too. It mentions a lot of North and West African countries.  Catch it if you can!