3/3 Revealing the breakthroughs which harnessed the elements' might to release vast power.
3/3 Featuring an amazing sequence of an osprey hunting over open water.
Chris Beardshaw delves into the micro-world of soil to reveal what it is and how it works.
High definition Signed
How the position of the sun in the sky affects the behaviour of animals and plants.
High definition Audio described
The Countryfile team visit the Merseyside coast around Southport.
The Coast experts journey along the stunning south coast of England.
The team head to the Isles of Scilly, where Ellie Harrison looks at the problem of rats.
4/26 A look at the science of breeding top quality Aberdeen Angus cattle.
9/13 Nicholas Crane visits John o'Groats and Cruden Bay on Scotland's east coast.
10/31 Neil Oliver visits an Atlantic sea monitoring station off the coast of Galway.