Climate changes from millions of years ago are recorded at daily rate in ancient sea shells, new research shows. A huge X-ray microscope has revealed growth bands in plankton shells that show how shell chemistry records the sea temperature. The results could allow scientists to chart short timescale changes in ocean temperatures hundreds of millions of years ago. This video shows computerised X-ray mircotomography of a plankton shell, less than a millimetre across, from measurements at the Diamond synchrotron. Credit: Oscar Branson, University of Cambridge