Gerry Northam goes behind the scenes to investigate 'open source' computer software.
Lionel Kelleway tries to get close to the grass snake, Britain's largest native snake.
2/6 Clare joins blind walker Rob Davies at Hulne Park, on the Duke of Northumberland's estate.
Geoff Watts finds out the use of experiments in weightlessness, similar to being in orbit.
North Korea's nuclear ambitions, the causes of the 1930s 'Dustbowl', and tool-using rooks.
Laurie hears of a new study which compares betting shops to 18th-century coffee houses.
4/4 The light bulb and the first moving pictures appeared.
6/8 Brett Westwood searches for the reasons behind the declining numbers of migrant songbirds.
How the Carteret Islands are slowly being submerged by the rising sea.
Lionel Kelleway gets very close to the marsh harrier.
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