2/6 Clare Balding walks with writer Philip Marsden from his home on the River Fal in Cornwall.
25/30 Heather Couper looks at arguments over the laws of physics and the universe's creation.
David Attenborough presents the purple sandpiper.
A Gloucestershire vet has conducted his own analysis of the impact of the badger cull.
24/30 What we can see is only a fraction of matter in the cosmos. Heather looks at dark matter.
Adam Rutherford examines a significant step towards the intelligent computer.
David Attenborough presents the snow bunting.
Five political parties at the NFU Conference explain their priorities for farming.
23/30 Heather Couper looks at the discovery of quasars, huge black holes a long way from Earth.
Bristol is Europe's Green Capital for 2015. Tom Heap finds out what that means.
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