After reading about a family died in their from a generator’s carbon monoxide fumes, Adebola Duro-Aina was inspired to do something about it. She enlisted three friends – Oluwatoyin Faleke, Eniola Bello and Abiola Akindele, all students between 14 and 15 years old in her science class – to help her find a solution to the problem.

The team decided to design a generator that ran off an alternative fuel that wouldn’t harm users, and so began the tale of how four teenage girls in Nigeria invented a urine-powered generator to create better – and safer – access to electricity.