Are stickers still saving lives? Was a coral reef repaired? Did the volcano erupt?
In this episode we check back in with three projects that have featured on our programme over the past four years and find out if everything went to plan.
We hear from the scientist who developed a sticker that stops car crashes, the people behind an insurance scheme for coral reefs, and find out if a plan to deliver aid before a disaster was up to the test.
Producer/presenter: Tom Colls
Reporters: Richard Kenny and Jo Mathys
Image: The Red Cross operation in Ecuador