A few years ago, Shahira Yahia and Ehab Usama were having a walk by the Qaroun Lake in Fayoum, looking for a solution to the recurring problem of the lake's troubled ecosystem. "The lake is exposed to the waste of three surrounding villages, so it's only natural that the fish die," Usama tells Startup Scene. They couldn't find a solution to what they originally went for, but they found huge amounts of shrimp shells instead - and this is what they worked with.