This week on Sunday Extra, a new study finds no evidence that medical cannabis was any more effective at treating anxiety and depression than placebos. 

The fascinating world of numbers stations, one of the oldest forms of encrypted communication which are still used by intelligence agencies to get messages to operatives in the field.

A new documentary from Werner Herzog called records a journey of conservation biologist Steve Boyes as part of his search for “a mysterious elusive herd of Ghost Elephants in the highlands of Angola”.

And why is the State government of Victoria going to introduce a fee for tourists visiting the Twelve Apostles along the Great Ocean Road.

Plus Dr Olivia Ong on the Year that Made Me, Tweet of the Week, Expanse: the Nannup Four, Lab Notes and more.