Many sensor prototypes (IMAGE) University of Groningen Caption Qi Chen of the University of Groningen built a sensor with plants she found at the University Campus. This image shows many prototypes of the sensor, each about the size of a postage stamp. Credit Leoni von Ristok - University of Groningen Usage Restrictions Credit must be given to the creator. Adaptations must be shared under the same terms. License CC BY-SA Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.