Sponge (IMAGE) University of Minnesota Caption The white sponge was obtained from a local store. After modification with nanotechnology, the same sponge, now red, captures mercury and kills microbes. Credit CFANS, University of Minnesota Usage Restrictions with credit 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.