Small Changes is a podcast series of one-on-one interviews with people who've seen a problem in the world and set out to change it – often in small and unexpected ways
https://www.theguardian.com/global-development/series/global-development-podcast
The cashless taxi system that's reducing Rwanda's traffic accidents
Entrepreneur Karanvir Singh has come up with a cashless system for motorbike taxis to help passengers get a fair deal – and improve road safety