5/5 How a Cambridge-based company designs 85% of the silicon chips inside all mobile phones. (R)
BBC Radio 4
Jim Al-Khalili meets chemist and science showman Andrea Sella.
BBC World Service
Brazil: How architect Oscar Niemeyer brought his extraordinary building designs to life.
BBC Radio 4 Extra
1/52 Alan Freeman kicks off his epic series, first broadcast in 1994.
BBC Radio 6 Music
5/5 Billy Kay on the coming of the Scots Parliament and the nationalists' hope for the future. (R)
BBC Radio Scotland
Arizona: Can law makers silence freight train horns at Flagstaff's level crossings?
John Waite tells the story of The Monkees, the successful 1960s pop group.
2/5 Melvyn Bragg considers the importance of culture to the discipline of anthropology.
Who are hacktivists and what motivates them?
18/24 The first day of 2013 sees Saving Species revelling in a winter wildfowl spectacle.
Paul Morley tests the contention that jazz is dead, a victim of its own history.
2/5 Brooke Magnanti reveals the mixed and mischievous reasons authors have hidden their names.
1/4 A tale of lost and found cats in Portsmouth presented by Alan Dein. (R)
Van Morrison talks to Ralph McLean. Repeated as part of 6 Music Celebrates Ireland.
BBC Radio Foyle
BBC Radio Ulster
1/3 Paul Gambaccini reveals the origins of the chart, which developed from sheet music sales.
BBC Radio 2
Ben Goldacre explores the idea of evidence-based policy.
Poet and accidental chainsaw owner James Lasdun learns how to chop wood. (R)
1/2 A first-hand account of the sixties from Vicki Wickham, who edited Ready Steady Go!
Euan McIlwraith continues his boat-themed Zone.
2/52 Alan Freeman explores the origins of popular music.
Wednesday 2 January 2013