At university I’ve learned, among other things, to be suspicious of arrows in figures. You know, the kind of figures with connected boxes and big words. I therefore found it quite refreshing when such a plot came up last Friday (during a talk about psychoneuro-endocrinology at a symposium in Luxembourg) and the speaker (Prof. Dr. Onno Meijer, University of Leiden, Netherlands) remarked: “The arrows are not arrows in real life; they are proteins.” I wish people in the social sciences would present their arrows with the same degree of clarity.