It’s not just the wall. There are lots of invisible barriers keeping immigrants from coming into the US. On this edition we explore some of those barriers.

We meet a three-year-old on Canada’s no-fly list; we speak to a student from India who grew up in the United States yet his visa expires as soon as he turns 21; we find out how much it costs to smuggle someone across the border and the lasting impact that debt can have on a family; and lastly we get a little loopy with musician Joe Kye.

(Image: A border patrol officer stands guard along the U.S.-Mexico border February 7, 2018 in San Ysidro, California. Credit: Sandy Huffaker/Getty Images)

Former homeland security adviser Fran Townsend says we need new methods of addressing gun violence.

Also: we learn how the gun lobby brought gun violence research to a halt in one US agency; a constitutional scholar puts America’s right to bear arms in a global context; Russian bots seize on the Parkland shooting to amplify divisions; gun rights supporters say Israel could serve as a model for the US but some Israelis disagree; and what does a year of mass shootings sound like ... in piano notes? Listen here.

(Image: Marjory Stoneman Douglas High School student Emma Gonzalez speaks at a rally for gun control at the Broward County Federal Courthouse in Fort Lauderdale, Florida on February 17, 2018. Credit: Rhona Wise/Getty Images)

"I got out of the car and I looked at the people and they all looked like me… and at that moment I realised where I came from."

On the programme: A fourth-generation Chinese American travels to his ancestral village in China; two Chinese adoptees return to their orphanage to help those left behind; Reem Kassis hopes her cookbook 'The Palestinian Table' will help her kids connect to their heritage; some residents of New Mexico have received surprising news about their ancestry; plus a man in California embarks on a dangerous quest to revive Yemeni coffee.

(Image: After a long search, 64-year-old Russell Low (left) visited his great-grandfather's ancestral home in Guangdong Province in southern China in May 2016. Credit: Ariana Lai)

Six stories that all take place within greater Boston.

#MeToo echoes through a play about Nigeria; a black church provides sanctuary to an unauthorised immigrant from El Salvador; two Rohingya refugees start a new life; a chef brings back lessons from a three-star restaurant in Paris; a university student prepares to be the first black ice hockey player to skate for team USA in the Olympics; and a preview of a show by The James Hunter Six coming to Boston soon.

(Image: A rainbow arcs over the skyline of Boston University in Boston, MA. Credit: Darren McCollester/Getty Images)

Levi Draheim, 10, is suing the US government over climate change with 20 other young people.

Also: fishermen in Greenland are doing better than ever, and that’s in part thanks to climate change; instead of fighting global competition, Alaska's wild salmon industry (reluctantly) embraces it; a researcher imagines what the US would look like if sea levels were to rise by two meters; solar power entrepreneurs come to Puerto Rico; plus what it’s like to fly in a plane when most of the passengers are pets.

(Image: Levi Draheim, 10, lives in Satellite Beach, Florida. Credit: PRI’s The World)

Fewer international students are coming to the US for post-graduate degrees in science and engineering. We look into why.

Also: Cuba has a lung cancer vaccine but many US patients can’t get it without breaking the law; a tech start-up synthesizes Marco Werman’s voice; tomato pickers in Florida work together to stop sexual abuse; a bioengineer has a plan to defeat disease-bearing mosquitoes with mobile phones; plus the band Mosquitos releases their first album in 10 years and the buzz is that it’s great.

(Image: Stanford bioengineer Haripriya Mukundarajan, center, began the Abuzz project after contracting malaria while she was in college. Credit: Kurt Hickman)

Jasiel López never expected to be an activist. Then he learned that the DACA programme, which allows him to stay in the US, could be rescinded.

Also: why the jarana, a guitar-like instrument from Mexico, is showing up at protests in the US; women veterans want their voices to be heard in the #MeToo movement; we remember Mathilde Krim, who played a pivotal right in the fight against AIDS; and we speak to the authors of a biography of Josephine Baker, singer, dancer, and civil rights activist.

(Image: Jasiel López is a student at Florida International University in Miami. Credit: PRI’s The World )

For George Lampman and Lee Sook Ei it was love at first sight. Then, the Korean War broke out.

Also: A monastery in Missouri, about to close its doors, is saved by monks from Vietnam; Spanish speaking actors in Miami unionise to fight for better working conditions; doctors in the US get lessons from doctors in Cuba in how to reduce infant mortality; an amateur mathematician from Tennessee discovers the largest known prime number; plus we listen to Bjork and reminisce about unrequited crushes.

Flying out of the US? You might have to go through a facial scan at the airport. We discuss the implications of that.

Plus: we find out why a selfie app that drastically alters the way you look is all the rage in China; we get introduced to the women artists of the Renaissance who have been hidden in the archives; we meet a man who survived the Holocaust by drawing portraits of his Nazi guards; plus comedian Dean Obeidallah discovers that for a moment he was literally the face of fake news.

About 80 percent of garment industry workers are women. For the past few months, Jasmine Garsd has travelled the globe to meet these workers, in person.

We start in Roanoke Rapids in North Carolina, a formerly bustling cotton mill town, that’s gone quiet. Next, we go to Los Angeles, were we learn how a sweatshop raid in 1995 changed the garment industry in the US forever. Lastly, we got to Bangladesh, where a large portion of our clothing now gets made.

Want to find out how fair your fashion is? Here’s the website mentioned in the programme: https://interactive.pri.org/2017/fair-fashion-quiz/

(Image: Mother and daughter, Rongmala Begum (standing) and Mayna Begum, both work in clothing factories in Bangladesh. Credit: Ismael Ferdous/PRI)