Hi! we are currently conducting our feasibility study and we're given a theme: FRUGAL INNOVATION (Doing more with less resources). we needed a product that is marketable but also have a relevance to the society (can help solve problems often faced by people e.g. traffic, pollution, crime, etc..). we are having a hard time deciding on what product we will do so please give us some of your ideas. A lot of thanks! NOTE: the product must haven't been invented yet.