Nest is a proposed service that uses a mobile app and measurement devices to allow families to monitor daily life and health information. It aims to create a bridge between family and doctors by allowing remote monitoring and consultations. The system would include a "Birdie" device to take measurements like temperature and allow two-way audio calls. Users could view timelines, share data, search by tags, and sync across devices. The project envisions future developments like integrating with other connected devices and focusing on specific illnesses.