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Poet Mab Jones explores the concept of 'Hiraeth' in the poetry of Wales and further afieldHiraeth, a central theme of Welsh language poetry and song, is a feeling of something lost, a long time ago, whether national identity or a once-important language. It has deep roots - some link it to the loss of self-determination in 1282. It has no equivalent in English, often translating as 'homesickness', but incorporating an aspect of impossibility: the pining for a home, a person, even a national history that may never have actually existed. To feel hiraeth is to experience a deep sense of incompleteness. Longing and absence has infused Welsh songs and poetry for centuries, so perhaps in the national temperament there's a perpetual tension between staying and leaving, a yearning for something better, a grief for something left behind. But there are equivalents in other languages - in Portuguese, 'saudade' is an impossible longing for the unattainable, so there are occurrences of the sentiment across a wide cultural spectrum. But if the English don't have a word for it, does that mean they don't feel it, or that they don't need it? For some, like Mab's former Professor at Swansea, M Wynn Thomas, 'hiraeth' can function as a default nostalgia button, and a dangerous tendency to believe things were better in the past. It's an experience characteristic of the powerless, the dispossessed; it's the signature tune of loss, but is this hopeless and persistent longing holding this small nation back? Mab Jones is a poet and performer both humorous and deeply serious. She stands outside the Welsh language tradition, claims she doesn't feel hiraeth (not for Wales anyway - possibly for Japan), and for Radio 4 questions and pokes at the concept, visiting the National Eisteddfod for the first time in an attempt to put her finger on exactly what it is. Exploring the concept through poetry that expresses it, from the poets Menna Elfyn and Ifor ap Glyn she hears poems and songs that deal with aspects of Welsh history that might explain the continued existence of the word in Welsh - forced removals from much loved homes through industrialisation and military eviction. And she talks to writers who live between two worlds and struggle with a sense of belonging: Pamela Petro, an American writer who fell in love with the landscape of Wales in her twenties, and Eric Charles Ngalle, a Cameroonian poet and refugee, who made a life in Wales while unable to turn his mind to his original home, and the trauma that made him leave his family aged 17.

In the Jim Crow era of racial segregation, travelling in the United States was fraught with difficulties if you were black. At best it was inconvenient, as white-owned businesses refused to serve African American motorists, repair their cars or offer them hotel accommodation. At worst, travel could be life-threatening if you walked into the wrong bar in the wrong town. That's why in 1936 Victor H Green, a Harlem postal worker, published the first edition of The Green Book. The guide listed hotels, restaurants, bars and service stations which would serve African Americans and was an attempt, in Victor Green's words, "to give the Negro traveller information that will keep from him running into difficulties and embarrassments". 'Embarrassments' seems rather a tame word for the outright hostility and physical danger which many black travellers experienced in segregation-era America. The Green Book became a catalogue of refuge and tolerance in a hostile and intolerant world. Alvin Hall hits the highway, Green Book in hand, to document a little-known aspect of racial segregation: the challenges - for mid-20th century America's new black middle class - of travelling in their own country. Alvin's journey starts in Tallahassee, Florida, where he was born and raised, takes him through Alabama and Tennessee and concludes in Ferguson, Missouri.The guide ceased publication soon after the passing of the Civil Rights Act in 1964. But, as Alvin discovers in Ferguson, many African Americans still feel far from safe as they drive. Alvin asks whether the Green Book ceased publication too soon.Interviewees: Carolyn Bailey-Champion, Dr. Charles Champion, Leah Dickerman, Jerome Gray, Prof. Allyson Hobbs, Ryan Jones, Maira Liriano, Ron McCoy, Robert Moman, Dr. Gwen Patton, Calvin Ramsey, Tiffany Shawn, Rev. Henry Steele, Bryan Stevenson and Rev. Starsky Wilson Producer: Jeremy GrangeArchive audio courtesy of PBS, CBS and CNNPhotos: Jonathan Calm.

Bobby Friction has started to realise that his day-to-day online activities are not only being monitored but in some senses manipulated. How often he interacts with specific friends, pages or sites sculpts and filters everything and everyone he comes into contact with online. Since the Brexit vote and the US election these bubbles have become a really big issue - with talk of fake news, post-truth politics and online communities increasingly divided. When, like Bobby, you decide you've had enough of living in a social media bubble, what can you do to change things? Is it possible for an ordinary person a user of social media to beat the system or is it only technology nerds who can do it? And really - is there any benefit to breaking out of the bubble? The Producer is Perminder Khatkar.