Thousands of Bangladeshi addicts are hooked on Yaba - a mix of methamphetamine and caffeine. It's a powerful drug that gives big bangs for small bucks. The Yaba epidemic has ripped through the population of Bangladesh, urban and rural, poor, middle-class and rich. This is a drug that's manufactured in industrial quantities in the jungles of neighbouring Myanmar. As the economy of Bangladesh has boomed, drug lords have worked to create new markets for their product. And the Rohingya crisis - when nearly a million fled Myanmar for Bangladesh - has created further opportunities for the traffickers, as desperate refugees have been employed as drug mules. The Bangladeshi Prime Minister, Sheikh Hasina, declared a 'war on drugs' last May. Thousands have been arrested. But critics see a disturbing trend - hundreds of suspected Yaba dealers have been killed by law enforcement.

Presenter / producer: Linda Pressly with Morshed Ali Khan

Brazilians wept when their 200-year-old National Museum went up in flames last September. Twenty million items, many of them irreplaceable, were thought to have been reduced to ash when it was gutted by a massive fire. Staff said the loss to science and history was incalculable - and the tragedy, possibly caused by faulty wiring in the long-underfunded institution, led to much national heart-searching about the country's commitment to its heritage. The museum, housed in Brazil's former Imperial Palace in Rio de Janeiro, held unique collections of fossils, animal specimens, indigenous artefacts, as well as Egyptian and Greek treasures - and the oldest human skull found in the Americas.

For some in Poland the Cursed Soldiers are national heroes; for others they are murderers. A march in celebration of a group of Polish partisans fighting the Soviets has become the focus of tension in a small community in one of Europe’s oldest forests. Those taking part believe the partisans – known as the Cursed Soldiers – were national heroes, but others remember atrocities committed by them 70 years ago. Some partisans were responsible for the burning of villages and the murder of men, women and children in and around Poland’s Bialowieza forest. The people living the forest are Orthodox and Catholic, Belorussian and Polish; this march threatens to revive past divisions between them. Many believe that far-right groups have hijacked this piece of history to further their nationalist agenda. For Crossing Continents, Maria Margaronis visits the forest to find out why this is causing tensions now; why the locals feel the march is making them feel threatened; and how this reflects wider political rifts in Poland today.

Produced by Charlotte McDonald.

Hunting western paedophiles is a priority for a new police unit tasked with safeguarding children in Nepal. Mired in poverty and still recovering from a devastating earthquake in 2015, Nepal is increasingly being targeted by foreign paedophiles who recommend it as a destination when they share child abuse tips on the dark web. In recent years, a series of western men have been charged with raping or sexually assaulting Nepali boys. For Crossing Continents, Jill McGivering follows the under-resourced police unit, hears the stories of victims and perpetrators and examines what makes Nepal so vulnerable to abuse by western men.

This programme contains descriptions of child sexual abuse which some listeners may find distressing.

Produced by Caroline Finnigan.

Eastern Ukraine has been under assault from Russian backed rebel forces for the past five years, but few have heard of a smaller conflict, which could be brewing in the west of the country, between Ukraine and Hungary. Some have accused the Hungarian Prime Minister Viktor Orban of trying to create a breakaway state in impoverished Transcarpathia, once part of the Austro-Hungarian empire.

Ukraine and Hungary both expelled diplomats from each other’s nations, following a row over passports and a Hungarian cultural centre has been repeatedly firebombed. Lucy Ash meets people in the Ukrainian border town of Berehove and investigates whether deepening tensions could destabilise the region and further dash Ukraine’s hopes of being a unified country inside NATO and the EU.

Producer: Josephine Casserly

(Image: Pupil at a Hungarian-language secondary school in Berehove in Western Ukraine walks down a corridor bearing a portrait of Lajos Kossuth, the 19th Century political reformer after whom the school is named. Credit: Balint Bardi)

Elderly pensioners in Japan are committing petty crimes so that they can be sent to prison. One in five of all prisoners in Japan are now over 65. The number has quadrupled in the last two decades, a result it seems of rising elderly poverty and loneliness, as seniors become increasingly cut-off from their over-worked offspring. In jail old people at least get a bed, a routine and a hot meal, and for many, as Ed discovers, the outside world can seem like a threatening place. For the prison authorities it means an increasingly ageing population behind bars and the challenges of dealing with a range of geriatric health issues.

Produced and reported by Ed Butler.

Old enemies Serbia and Kosovo discuss what for some is unthinkable - an ethnic land swap. This dramatic proposal is one of those being talked about as a means of normalising relations between these former foes. Since the bloody Kosovo war ended with NATO intervention in 1999, civility between Belgrade and Pristina has been in short supply. Redrawing borders along ethnic lines is anathema to many, but politicians in Serbia and Kosovo have their eyes on a bigger prize... For Serbia, that is membership of the European Union. But the EU will not accept Serbia until it makes an accommodation with its neighbour. Kosovo wants to join the EU too, but its immediate priority is recognition at the United Nations, and that is unlikely while Serbia's ally, Russia, continues to thwart Kosovo's ambitions there. Both of these Balkan nations want to exit this impasse. And a land-swap, giving each of them much-coveted territory, might just do it. For Crossing Continents, Linda Pressly and producer, Albana Kasapi, visit the two regions at the heart of the proposal - the ethnically Albanian-majority Presevo Valley in Serbia, and the mostly Serb region north of Mitrovica in Kosovo.

(PHOTO: Hevzi Imeri, an ethnic Albanian and Danilo Dabetic, a Serb, play together at the basketball club Play 017 in Bujanovac – one of very few mixed activities for young people in Serbia’s Presevo Valley. BBC photo.)

At 12, Douglas Braga arrived in Rio de Janeiro, a wide-eyed boy, ready to live out the Brazilian dream and become a professional footballer. At 18, he was signed by one of the country’s top teams - but was also starting to realise he couldn’t be true to himself and be a footballer. By 21, he’d quit the game. He knew he was gay and felt there was no place for him in a macho culture where homophobia is commonplace and out gay men are nowhere to be seen.

Now, at 36, Douglas lives in a country that just elected a self-styled “proud homophobe” as president, which some football fans have taken as a licence to step up their homophobic abuse and threats. But Douglas is back on the pitch and - with a growing number of other gay footballers - fighting back.

Reporter David Baker

Thirty years on from the 1988 earthquake in Armenia, what’s happened to the devastated town of Spitak? Rescuers from all over the world came to help search for survivors – among them a team of British firefighters. Now, with reporter Tim Whewell, two of those men are returning - to see how the town’s been rebuilt - and to remember a rescue effort that marked a turning point in East-West relations. The disaster came as Soviet leader Mikhail Gorbachev was developing his policy of glasnost (openness) – and his request for foreign assistance was the first such appeal the Kremlin had made in decades. The firefighters relive the drama, grief and courage of those days – and renew old friendships. They discover that Spitak has still not fully recovered from the quake, with many living to this day in squalid temporary housing.

Reporter Tim Whewell.

Where do you come from? Tracing your ancestry in the USA is one of the most popular hobbies along with gardening and golf. TV is awash with advertising for the do-it-yourself genetic testing kits which have become much sought after gifts, especially at Christmas time. The kits have revolutionised family tree research and gone are the days of sifting through old documents. But, as Lucy Ash reports, the DNA results are now revealing far more than many had bargained for. How do you react when you find out your mother had a secret affair half a century ago…and the man who raised you isn’t your dad? Produced by Charlotte McDonald.