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Millions of us use this gesture but where does this everyday ritual come from?
BBC World Service Online
Latest from the region's rivers and reservoirs with Railton Howes.
Y diweddaraf o'r byd ffermio gyda Dei Tomos.
BBC Radio Cymru
Helen Mark visits a restored open cast mine in Leicestershire, now a haven for wildlife.
BBC Radio 4
With ash dieback now in the wild in the UK, Anna Hill reports on our threatened woodlands.
Gerallt Pennant yn ein deffro ar fore Sadwrn.
Euan McIlwraith listens in on the rich agricultural tradition of bothy ballads.
BBC Radio Scotland
Food, countryside and agricultural issues, plus business, industry reports and new tech.
BBC Radio Foyle
BBC Radio Ulster
The Children's Commissioner for Wales talks about sexual abuse at children's care homes.
BBC Radio 5 live
Are humans creating a new geological epoch through climate change and fossil fuels?
Sunday 4 November 2012