Josephine Abongo's shop in Nakuru's Burma market would not win any beauty contests. From afar, it resembles a forgotten shack.

But a close-up through the gaps in the wood planks lining the windows reveals a flicker of warmth- a bustling hive of progress, fuelled by the relentless energy of a woman who traded research reports for revolutionary cook stoves.

Josephine, once a research consultant with a nose for data, now has a nose for cleaner air, and the roar of her motorbike engine characterises her days as she delivers the future of healthy cooking, one less smoky kitchen at a time.