Marius Simonsen in the Lab (IMAGE) University of Copenhagen Caption Marius Simonsen wondered why the dust particles from the interglacial period - the warmer period of time between the ice ages - were several times bigger than the dust particles from the ice age. Credit Paul Vallelonga Usage Restrictions None 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.