Voyager reveals active volcanoes on Io, one of Jupiter's 60 moons, leading scientists to envisage what walking on the moon's surface would be like.
Patrick describes his experience with bipolar disorder after being hospitalised following a manic episode.
Chloe Watts meets former builder John Beech, who now develops video games that allow players to create their own levels and share them with a community.
Jim AlKhalili discusses the law of refraction originally developed by Ibn Sahl, but often attributed to Willebrord Snellius.
Coastal geomorphologist Rob Dr Rip Brander shows Brendan Moar what happens to his heart rate when caught in a rip current.
The terms proposition and opposition are defined in this clip from the documentary Up For Debate, with an introduction to the components of a debate speech.
Neil Oliver meets metallurgist Marcos MartinonTorres who demonstrates how silver was extracted from lead by Romans.
Historians discuss photograph attributed to Frank Hurley of dead and wounded Australians and Germans in railway cutting near Ypres.
Richard Smith explains how the rusting of the oceans produced the iron ore now mined in the Pilbara.
Becky Parker and Johnny Hudson demonstrate how atoms can be in two places at once.
Neil Oliver examines the skeletons of the Viking victims of the St Brice's Day massacre at Oxford and describes how the bones reveal how they died.
Arthur Calwell orders deportation of Asian wartime refugees but Indonesian O'Keefe family resists.
Billy Hughes obstructs racial equality clause at Treaty of Versailles to protect White Australia policy.
Alan Davies and Marcus du Sautoy visit a length bar interferometry unit and use a laser tracker to measure Alan's length of string.
Marcus du Sautoy demonstrates how Babylonians used quadratic equations to calculate areas of land.
Seth Lloyd leads Alan Davies through Erwin Schrodinger's quantum physics thought experiment, where a cat is both alive and dead at the same time.
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.