I’m sorry that I have been quiet for some time; there have been a lot of things to do and very little time to do anything else. Many days I have been working in the lab until late in the evenings. We have got interesting water samples from Greenland, from around 20 locations east, south and west of Greenland. Samples have been taken by both Greenland and Danish ships during the last year, stored at Greenland and now finally sent to us. They are large! Each sample is around 500 litres! The sizes of the samples are large because we analyse many radioactive and stable isotopes in them. The purpose is that we will try to determine the transport time of water moving from the European continent to these locations. Since we know the releases of the radioactive elements and how they have changed in time, we can use the ratios and concentrations to calculate transport times and dilution factors. This means we can say that if someone is adding for instance 1 kilogram of pollutant per cubic metre to the North Sea we can tell how much the concentration will be in waters around Greenland and what time it will take to transport it there. Of course this can be made by models used in physical oceanography as well but tracers in the oceans are an excellent compliment to these models. At least they tell the truth while models at their best only present a good probability.