For example, we all hear that we should limit blue light exposure in the evening – and that a weekend of camping can help re-align our bodies to the day night cycle. But we currently lack easy, consumer wearables that are tailored to measure just how ‘misaligned’ our bodies are. Smart dust that collects light, temperature and activity data from users and their ‘natural environments’ aims to create a poignant representation of health by helping people understand the stability of their behavior and physiology in relation to their environment. A more distant application is the development of autonomous sensor networks. Precise, wirelessly transmitting and energy harvesting, these networks could be used for health monitoring with zero input from the user, to allow them to truly forget they are ‘wired in’ to a device.