Gold Aerogel (IMAGE) ETH Zurich Caption Even when it seems unbelievable: these are genuine photographs, in which nothing has been faked. E.g. the 20 carats gold foam is lighter than milk foam. Credit Gustav Nyström and Raffaele Mezzenga / ETH Zurich Usage Restrictions The image may be used if ETH Zurich is specifically mentioned as the copyright holder and only in connection with reports about the here discussed paper. Further distribution - for example, via download links - is not permitted. 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.