water droplet and cargo carrier (IMAGE) The University of Hong Kong Caption (upper photos) showing the split of an ethanol droplet by a beam of light on the photopyroelectric microfluidic platform. (below) showing a light-controlled cargo carrier with droplet wheels transporting a solid cargo. Credit The University of Hong Kong Usage Restrictions None License Licensed content 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.