Being a teenage mum is not easy. But innovative projects around the world are trying to help.

A young scientist has developed a white powder which gives waste soil concrete-like properties.

But the European building industry is also excited about his new, low carbon building material.

Robots that navigate sewer pipes are being used to find leaks and blockages in an ancient water system.

Lotteries aren’t just about winning money. They’re also being used to nudge people to change their behaviour.

In the UK we try out a mobile app that enters users in to a £25,000 lottery every time they pick up a piece of litter.

We see how heart patients in the US can win smaller prizes for taking their pills… and if they don’t take their medicine, are told what they could have won.

And we look at receipt lotteries, where customers are encouraged to get receipts as each one is an entry to a big monthly draw. The scheme started in Taiwan but has been replicated in a number of countries, helping governments find the businesses avoiding tax.

Presenter: Myra Anubi

La Casa de Carlota isn’t like most workplaces. The design studio, based in Barcelona, Spain, employs creatives who have intellectual disabilities, autism and schizophrenia.

Sponge cities use natural features to slow down, soak up and reuse flood water.

Meet the entrepreneurs using scrap rubber to fuel cars and make new tyres.

Each year, over a billion car tyres reach the end of their life.

They’re notoriously hard to recycle and present an environmental hazard if left to disintegrate out in the open.

But around the world, people are trying to clean up their cities by finding new uses for the mountains of rubber waste.

In Senegal, a young entrepreneur is turning them into artificial football pitches. In Zambia, an engineer is perfecting a way to turn these tyres into diesel. And in Canada, a company is making new tyres out of old ones using some very clever chemistry.

In California, butterflies such as the monarch are critically endangered as a result of habitat erosion, pesticides, and climate change. But many people are trying to save these beautiful insects.

We meet the scientists who are painstakingly rearing individual butterflies by hand and then releasing them back into the wild.

And at the famous butterfly groves on the coast, we see the first signs of recovery.

Presenter: Myra Anubi

Photo: A monarch butterfly (Getty Images)

Fish have favourite colours and dolphins hate high pitched noises.

Hospitals can make you sicker. It's a strange thought for places that also can make you healthier. But think about the constant noise, the distinctive hospital smell, the bright lights.

There's lots of evidence that most patients find hospitals themselves very stressful. This stress can lead to slower healing times or even a higher chance of being readmitted to hospital.

This week, we look at some interesting work happening around the world to try to improve the hospital environment.

We hear from people who are using nature to heal, are redesigning lighting systems and are blocking out the noise. And by learning what stresses humans out, we can learn a lot about how our bodies recover and heal.