Neil Oliver meets weapons expert Andy Deane who demonstrates the use of the long, iron slashing swords used by Celtic tribes to resist Roman invasions in the first century BC.
Naturally Australia describes how fishing and tourism brings people to the Great Barrier Reef, and why those industries need to be managed to keep the reef healthy.
The Cassini probe images revealed lakes on Saturn's moon, Titan, and scientists try to reproduce the detected elements to understand if life could exist in liquids other than water.
Brian Cox revisits one of his favourite books from his childhood, Stewart Cowley's Spacecraft 20002100 AD, and considers how different it is to reality.
Computer animations reveal how earthquakes cause megatsunamis, as University College London's Bill McGuire explains why the giant tidal waves are so destructive.
Arthur Calwell secretly secures displaced Europeans for migration to build Australian infrastructure.
Charles Perkins takes action to prevent fiveyearold Nancy Prasad's deportation to Fiji in 1965.
Neil Oliver examines the Battersea Shield and Kirkburn Sword as examples of Celtic art in Iron Age Britain.
Female green turtles dig into the sand on Raine Island to lay around 100 pingpong ballsized eggs each, leaving them to incubate in the warm sand, before returning to the water.
Michael Mosley swallows a tiny camera for a tour inside the human digestive system.
Neil Oliver visits the Jelling Monument, established by King Harald Bluetooth to mark Denmark's conversion to Christianity.
A look inside the working of Australia's Bell Theatre Company and the work and emotions involved in staging Shakespeare's Hamlet
Neil Oliver studies the Helgo Treasure in Stockholm as evidence of the extent of the Vikings' travels, including a bishop's staff from Ireland, a ladle from Africa and a Buddha statue from India.
Xanthe Mallett joins Australian Customs officers as they go in search of ghost nets, the discarded fishing tackle that endanger marine life.
Tim Flannery meets the Australian Institute of Marine Science's Eric Matson, who demonstrates how coral cores provide a record of environmental change.
Historian Hamish MaxwellStewart gives Neil Oliver a tour of the Port Arthur convict settlement, revealing the detailed records of prisoners, and visiting the panopticon prison and solitary confinement cells.
In 1824 Windradyne leads Wiradjuri in resistance against British settlers colonising their traditional lands and Governor Thomas Brisbane declares martial law.
In 1886 the Aboriginal Protection Board helps draft HalfCaste Act in Victoria, forcing Indigenous people off reserves and to assimilate with Europeans. As reserves close, Indigenous people are forcibly moved to Lake Tyres Mission.