Stories and insight don't come much better than this. 

Marcus and Jack started YourZooki because they wanted a product for themselves that didn't exist. So they found a way to make it and they convinced people to buy it. Four years on, they are in over 2500 retail stores, sell a product every 5 seconds and have just launched into GNC in the US. And the best part of it all - the products remain niche and the scope of the opportunity that presents itself would suggest that they've only just got started. 

If you didn't know YourZooki before this podcast, I guarantee you'll not forget them after listening to this podcast.