Discovery: Judith Bunbury

Geo-archaeologist Dr Judith Bunbury reflects on the Sahara Desert. Though now an unrelenting, frazzling, white place she claims that 3,500 years ago, the region looked more like a safari park. In discussion with presenter Jim Al-Khalili, she reveals how people adapted to their ever-changing landscape, via evidence buried in the mud, dust and sedimentary samples beneath these ancient sites