Aubrey Manning concludes his history of how humans evolved in Africa six million years ago. Pictures, Words and Modernity. Manning ventures into Stone Age caves in France and South Africa searching forthe dawn of the modern mind. Is the evidence painted on the walls, or is it carried in fine bone needles made by African hunter-gatherers of 90,000 years ago? Producer Andrew Luck-Baker . E-MAIL: scirad@bbc.co.uk