Brian Cox inspects the Svalbard Global Seed Vault in Norway, where 800,000 collections of seeds are stored, and meets conservationist Cary Fowler, who initiated the project.
Brian Cox visits Florida's Dolphin Research Center where dolphins are able to tell the difference between the English terms less and more.
Brian Cox travels to the Ethiopian Highlands to study geladas, which share a common ancestor with humans and exhibit one of the more complex social structures of the primates.
Dr Mark Cross discusses depression treatment with 18yearold who had said he'd wanted to die. (Coarse language).
Jeremy Bush, Janell Wicker Wheeler and Douglas Duvall recount the moment Jeff Bush fell through a sinkhole when the earth opened up under his bedroom in Florida.
Geologist Iain Stewart goes underground with Jason Polk to examine the kind of sinkhole that swallowed Jeff Bush in his Florida bedroom in 2013.
Neil Oliver visits Wedge Island, a Western Australian settlement without mains electricity, running water or shops, where residents live in 350 shacks and rely on generators and recycled goods.
A Townsville control tower manages ships navigating the Great Barrier Reef, where they try to avert accidents, such as the MV Shen Neng 1 oil spill in 2010.
The rivalries between cousins Wilhelm II, George V and Nicholas II come to a head upon the assassination of Franz Ferdinand.
A Muslim woman describes an incident where she was racially abused in Sydney and Simon Reeve reflects on her sense of Australian identity.
National Rifle Association president Charlton Heston speaks at the organisation's convention in Denver, near Columbine, shortly after the massacre and is met my protesters.
Michael Moore compares gun violence statistics and cultural differences around the world. An animation of American history, guns and the Second Amendment is included. (Depictions of violence).
Matthew Roberts demonstrates how he collects data to study changes to glaciers in Iceland on a visit to Solheimajokull Glacier, studying ablation rates to understand climate change.
Shaun Micallef helps prepare a cave ahead of a meeting with a guru, where they discuss life beyond the cave as an illusion and a single divine consciousness.
Shaun Micallef treks high into the Himalayas to the source of the river Ganges, the source of life in India.
Alan Davies and Marcus du Sautoy visit the UK's National Physical Laboratory, where Mark Oxborrow takes them through an experiment that demonstrates how prime numbers exist in nature, and the Riemann hypothesis.
Clinical teaching, where teachers outline learning goals and success criteria, is outlined.
Science class develops wellbeing strategies to help deal with stress ahead of exams.
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