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Terrorism: does it work? Also, the origins and development of the 'hotline'.
Chris Packham presents the mallard.
Caz Graham meets Hannah Jackson, a young shepherd shaking up the world of sheep.
Do people in rural areas get poorer care than those in urban Britain?
Clare Balding discovers the Doolough Tragedy Famine Walk in County Mayo, Ireland.
5/5 Bernie Krause turns to the sounds and noises generated by modern human beings.
David Attenborough presents the shelduck.
Irish police farm raid, an Archers symposium, James Herriot in Moscow and retired farmers.
4/5 Bernie Krause explores how organisms evolve to acoustically structure their signals.
Testing cyber security with science.