Sea water temperatures in the past can be established on the basis of the chemical composition of micro-organisms. Ulrike Fallet, a NIOZ PhD-student, developed a series of ‘paleothermometers’ based on the calcareous skeletons of Foraminifera and on the organic remains of micro-organisms, and she used these to deduce sea water temperatures in the Mozambique Channel in the past. Ms Fallet will defend her thesis at the VU University Amsterdam on 7 October.