This week we hear about three small solutions trying to make a dent on some big problems. We hear about an outdoor gym made from melted-down knives. We talk to the scout leaders in Madagascar trying to break taboos around periods. And in London we visit the community fridge, where locals can donate and take whatever they want.

Reporters: Amelia Martyn-Hemphill, Clare Spencer and Harriet Noble

Image: The Steel Warrior gym / Credit: BBC