sediment sample (IMAGE) Johannes Gutenberg Universitaet Mainz Caption Mass spectrometry image of a 5-centimeter-long sediment sample obtained from the Mediterranean Sea. The heat map indicates the spatial distribution of an alkenone-based climate proxy for sea surface temperature reconstruction on the sediment surface. Each pixel corresponds to an individual measurement at the resolution of 200 µm, where red colors represent warmer temperatures and blue colder. Credit photo/©: Igor Obreht Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.