Rensselaer Polytechnic Institute (RPI), an engineering university in New York State, USA, has announced the development of electric double-layer capacitors and lithium batteries composed of cellulose and carbon nanotubes (press release in English). These components are only tens of micrometers thick, equivalent to the width of a human hair, and can be bent like paper. Researchers at RPI believe that "in the future, it will be possible to manufacture batteries using roll-to-roll printing technology." The technical details will be published in the academic journal *Proceedings of the National Academy of Sciences* on August 21, 2007.