Images and messages that automatically erase themselves after a set period of time have long been a popular feature of spy films. Although this idea is already used for toy 'water pens', a more ...

Article subjects are automatically applied from the ACS Subject Taxonomy and describe the scientific concepts and themes of the article. In this study, the effects of different flotation agents and ...

Department of Physics, Umeå University, Umeå SE-901 87, Sweden Department of Physics, Umeå University, Umeå SE-901 87, Sweden Wallenberg Initiative Materials Science for Sustainability, Department of ...