1) The document outlines several activities exploring different smart sensors including making a microphone, evading motion detection, exploring the piezoelectric effect, and measuring sensor responses. 2) It then describes a proposed "Sentry" system using motion sensors and lights to detect if children are left on school buses to prevent tragic deaths. 3) The proposed system is intended to make school buses safer, notify drivers if children are present, decrease children's deaths, and assure parents of children's safety. It is recommended for implementation in all Qatari school buses.