Water bubble (IMAGE) Northwestern University Caption Water bubble emerging from a palladium nanocube. Viewed with a transmission electron microscope; scale bar equales 50 nanometers. Credit Vinayak Dravid/Northwestern University Usage Restrictions Add credit License Original 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.