Header (IMAGE) Aarhus University Caption Glasses with nearly 100 year old mussels and sea snails. The samples contain information on how the chemistry of the ocean was before nuclear tests and CO2 from industrialisation changed it. Credit Christof Pearce Usage Restrictions May only be used in communicating this story. 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.