How do you fulfil your sexual needs if you have a disability? How do you masturbate if you have limited use of your hands? These are problems that most able-bodied people have probably never considered. But if you’re in this position it’s something you probably think about a lot. And it’s a problem which Vincent, the founder of a small NGO called Hand Angels, is trying to help with. His group matches volunteers with disabled people to provide a sexual service. Mukul Devichand and Alvaro Alvarez go to Taiwan to hear the remarkably frank stories of the volunteers and the receivers at the service. They open up a world of deep disappointment of those people who haven’t experienced sex or intimacy and an organisation that thinks it has the solution. But can any service ever fill this gap or is it just a shallow fix.

Presenter: Mukul Devichand

Image: Vincent – the founder of ‘Hand Angels’ / Credit: BBC

The Data Donators

Meet Becky. She suffers from arthritis and is in constant pain. Like lots of people – patients and doctors alike – she has a hunch that bad weather could be exacerbating the problem.

It’s a question that has been asked for at least 2000 years, but we have never had the tools or resources to answer it. That is, perhaps, until now. Dr Will Dixon has set up a mass participation study that takes advantage of smartphone technology. More than 13,000 people have downloaded an app that has provided his team with a massive set of data, and by combing through it he hopes to answer the question once and for all. It’s not the only project of its kind, either. Around the world more and more people are launching similar projects – asking thousands of volunteers to donate their data for the greater good.

Presenter: Mukul Devichand

Image: Overlay of highlighted bones of woman at physiotherapist / Credit: Shutterstock

On the island of Jersey, postal workers don’t just deliver the mail. They also check up on elderly people during their routes. In a five minute chat, they check they’ve taken their medication and if there’s anything else they need. It’s popular with older people and their relatives, and the project has caught the attention of post offices - and health professionals - around the world. Could a chat on the doorstep help solve the social care crisis? We travel to Jersey to meet the man behind the idea, and join a postman on his round.

Presenter: Tom Colls

Image: Jersey postman Ricky Le Quesne / Credit: BBC

Parents struggling with childcare costs in London are banding together to care for each other’s kids. They run a super-cheap nursery where mums and dads take on half of the childcare. It’s a throwback to the childcare movement of the 1970s but can it work in the modern age?

Presented by Sahar Zand. Produced by William Kremer.

Image: Drawing of a family / Credit: BBC

There are no sewers in Haiti. 26% of Haitians have access to a toilet, so a lot of the sewage ends up in the water supply. Currently, Haiti is battling the biggest cholera epidemic in recent history and thousands are dying. We travel there to meet a team of women who are trying to solve this massive problem.

Also on the programme, a radical suggestion for airports: build circular runways. Are the current straight ones really the best way to take off and land?

Presenter: Sahar Zand

Image: The women of Haiti who work for the NGO Soil / Credit: BBC

Could we build cities using solar panels instead of walls? That’s the dream that Huang Ming, a wealthy entrepreneur in China’s Shandong province, has had since the 1980s. He’s become known as the ‘Sun King’ after building a vast solar park, including a showcase hotel, to prove a new kind of solar architecture is possible. So why hasn’t it caught on? We check into a room in the solar hotel and examine the vision and sometimes unfulfilled dreams of solar architecture in China.

Presenter: Mukul Devichand

(Image: Huang Ming and his solar hotel, Credit: BBC)

An innovative housing project in Amsterdam is attempting a new way of integrating refugees into the local population. In prefab flats, refugees from the Syrian war live next door to young people in need of cheap rent. They eat together, learn language together, and develop the networks that researchers say are critical to successful integration.

Presenter: Charlotte Pritchard

Image: Young people living in the Startblok / Credit: BBC

Air pollution is a huge problem for China, but did you know it’s actually getting better? The Air Quality Index in several cities is improving, because of a variety of experimental projects that are being rolled out.

Presented by Mukul Devichand and Vincent Ni.

Image: A woman wearing a face mask in central Beijing / Image credit: BBC

Voter turnout is a problem around the world, particularly in local elections. But a small group of academics and activists in the US are experimenting with a new way of getting people to turn up and put their cross in a box – a lottery. Every voter is entered and one lucky winner gets a big cash prize. World Hacks investigates whether it works.

Presenter: Kathleen Hawkins

Image caption: Lottery balls about to be drawn, Image credit: Thomas Samson / Stringer / Getty Images

Food waste is a massive global problem: the EU alone throws away 88 million tonnes a year. Much of this ends up in landfill and produces dangerous greenhouse gasses which contribute to climate change. In Europe 53% of food waste comes from households, and one woman has made it her mission to stop Danes throwing away food. We travel to Copenhagen to meet Selina Juul, a key part of Denmark’s food waste revolution.