Bubble Array (image) Penn State Share Print E-Mail Caption This is a chip-scale glass microspherical shell sensor array blown on a silicon substrate. Insert is a near-perfect spherical shell. Credit Tadigadapa Lab/Penn State Usage Restrictions Non commercial use only Share Print E-Mail 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.