Geologist and more: the multi-faceted genius who was loathed and revered in colonial Australia

Unearthing a mysterious figure from Australia's colonial times. Ferdinand von Sommer was Western Australia's first government geologist. He was also, in various parts of the world, a doctor, missionary, journalist, lecturer, naturalist and more. Was he a fraudster, or a genius? 

• Guest: Professor Alexandra von Ludewig  
• Producer: Ann Arnold