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A simple way to help a relative if they鈥檙e arrested

A group in California is teaching families how to help loved ones charged with crimes

• 23 mins

Putting a price on carbon

How to increase the cost of causing climate change

• 23 mins

Bangladesh鈥檚 biker girls

The motorbike taxi app where the drivers and passengers are all women.

• 23 mins

The concrete cleaners

Making cement that locks in carbon dioxide instead of releasing it into the atmosphere

• 23 mins

Oysters to the rescue

The humble oyster is helping to keep the oceans clean and protect shorelines

• 23 mins

A new way to detect an invisible poison in water

Scientists hope a new test will save millions from drinking arsenic in their water

• 23 mins

Meeting Colombia鈥檚 鈥榲iolentologist鈥�

How a doctor in Colombia changed the way cities monitor and prevent violence

• 23 mins

The snakebite squad

A team in Kenya has introduced motorbike ambulances for people bitten by snakes

• 23 mins

Spotting the sound of a cardiac arrest

Copenhagen is experimenting with a new way of analysing emergency calls

• 23 mins

Turning waste into energy

Instead of sending all our waste to landfill, some companies are using it to make energy

• 23 mins

Shopping for a better life

How a grocery store is bringing healthcare to people who can鈥檛 usually afford it

• 23 mins

The town rethinking the future of energy

Energy companies have come together in Finland to tackle climate change

• 23 mins

Gaming for good

Gamers are helping scientists to analyse research and develop new drugs

• 23 mins

The future of freight

Designing eco-friendly lorries to make cleaner, greener deliveries

• 23 mins

How to save the banana

The banana is under threat from a deadly disease. Meet the people are trying to save it

• 23 mins

How to stop fires destroying whole neighbourhoods

The innovative fire alarm designed to protect South Africa鈥檚 poorest communities

• 23 mins

Stopping abuse with protection dogs

Women who have left abusive partners are learning how to train their own protection dogs

• 23 mins

Saving the world鈥檚 ice

Silica beads and whiter clouds - ideas to stop the world鈥檚 ice melting

• 23 mins

Turning kids into entrepreneurs

Children in Uganda are running their own businesses thanks to special classes in school

• 23 mins

Convicting more rapists

Rapists often get away without being convicted 鈥� South Africa thinks it has an answer

• 23 mins

Making your deliveries greener

Four clever ways to reduce carbon emissions from deliveries

• 23 mins

Checking in with the problem solvers

Stopping forest fires with goats and more 鈥� an update on projects we鈥檝e visited before

• 23 mins

How to move the Earth

The plans to use lasers or asteroids to move our planet away from the sun

• 23 mins

The pharmacists fighting high drug prices

When drug prices went up, pharmacists stepped in to make medicines themselves

• 23 mins

Forecasting volcanoes

Preparing for disasters long before they strike rather than rescuing people afterwards

• 23 mins

Running to do good

Forget the treadmill - these people have turned doing good deeds into a workout

• 23 mins

Fighting depression together

Women in Uganda are learning how to treat their neighbours for depression

• 23 mins

The miracle cure: Exercise

If exercise were a drug, almost everyone over 65 would want to take it

• 23 mins

The good lads

Working with men and boys to tackle everyday sexism

• 23 mins

Meet the neighbours

People in these flats promise to spend two hours a week together to tackle loneliness

• 23 mins