Figure 1 (IMAGE) Tohoku University Caption Heat is released from the manganese oxide material when water molecules enter into its layered structure. Credit Norihiko L. Okamoto Usage Restrictions Reporters may use freely these materials in news coverage with appropriate credit information. 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.