From the Nile valley to the new world, science invention and technology. The London lectures of Dr. John Henrik Clarke and Dr Yosef Ben-Jochannan were delivered for the minority Ethnic Unit of the Greater London Council in 1986. Since then there had been a great demend for these lectures, which were recorded along with an extensive question and answer period. Dr Clarke has edited these lectures and has expanded the collection to include important biographical notes on both Dr ben-Jochannan and himself as well an invaluable reading guide on African history.