How do we identify solar signals in climate data? Two scientists (Kristoffer Rypdal from the University of Tromsø, Norway, and Yoav Yair, from the Interdisciplinary Center Herzliya, Israel) discuss this topic. This movie was produced by COST action TOSCA (Towards a more complete assessment of the impact of solar variability on climate), a multidisciplinary European network of scientists from 20 countries whose objective is to provide a better understanding of the hotly debated role of the Sun in climate change. For more information, and more movies, see http://www.tosca-cost.eu