Signs take a variety of forms. We use or encounter them every day in various areas. They represent perceptions and ideas: A letter represents a sound, a word or picture stands for an idea, a note for a sound, a chemical formula for a substance, a boundary stone for a territorial claim, a building for an ideology, a gesture for a cue or an assessment. On the one hand, we open up the world to ourselves by using signs; we acquire it, ensconce ourselves in it, and we punctuate it to represent ourselves in it. On the other, this reference to the world and ourselves becomes visible in our sign systems. As manifestations of a certain way of interacting with nature, the environment, and fellow human beings, they provide information about the social order or ethnic distinctions of a certain society or epoch as well as about how it perceives the world and humanity. As a man-made network of meanings, sign systems can be changed and, in doing so, change how we perceive the world and humanity. Linguistically, this may, for example, be done by using an evaluative prefix: human – inhuman, sense – nonsense, matter – anti-matter or by hierarchizing terms, as in upper class and lower class. The consequences of such labeling, therefore, may decide on the raison d'être of the signified within an aspect of reality and the nature of this existence. Since ancient times we have reflected on signs, at first mainly in philosophy. Each era has created theories of signs as a means of approaching its essence. Nowadays semiotics is especially concerned with them. While linguistics focuses on linguistic signs, semiotics deals with all types of signs and the interaction of components and processes involved in their communication. Semiotics has developed models, methods, and concepts. Semiosis and semiosphere, for example, are concepts that illuminate the processing of signs, i.e. the construction of meaning and the interaction of different sign systems. A sign is not limited to a monolithic meaning but is culturally contingent and marked by the socioeconomic conditions of the individual decoding it. Sociopolitical and sociocultural developments therefore affect the processing of signs. Dealing with signs and sign systems, their circulation, and reciprocal play with shapes and interpretive possibilities is therefore an urgent and trailblazing task in light of sociocultural communication processes in our increasingly heterogeneous society to optimize communication and promote intercultural understanding as well as to recognize, use, and bolster social trends. The articles in this magazine illustrate the many ways academia is involved in researching, interpreting, and explaining signs. Social scientists at the University of Potsdam are examining whether statistics about petitions made by GDR citizens can be interpreted retrospectively as a premonitory sign of the peaceful revolution of 1989. Colleagues at the Institute of Romance Studies are analyzing what Alexander von Humboldt’s American travel diaries signalize, and young researchers in the Research Training Group on “Wicked Problems, Contested Administrations” are examining challenges that seem to raise question marks for administrations. A project promoting sustainable consumption hopes to prove that academia can contribute to setting an example. An initiative of historians supporting Brandenburg cities in disseminating the history of the Reformation shows that the gap between academia and signs and wonder is not unbridgeable. I wish you an inspiring read! Prof. Dr. Eva Kimminich Professor of Romance Cultural Studies

Data assimilation? Stop! Don’t be afraid, please, come closer! No tongue twister, no rocket science. Or is it? Let’s see. It is a matter of fact, however, that data assimilation has been around for a long time and (almost) everywhere. But only in the age of supercomputers has it assumed amazing proportions. Everyone knows data. Assimilation, however, is a difficult term for something that happens around us all the time: adaptation. Nature in particular has demonstrated to us for millions of years how evolutionary adaptation works. From unicellular organisms to primates, from algae to sequoias, from dinosaurs ... Anyone who cannot adapt will quickly not fit in anymore. We of course have also learned to adapt in new situations and act accordingly. When we want to cross the street, we have a plan of how to do this: go to the curb, look left and right, and only cross the street if there’s no car (coming). If we do all this and adapt our plan to the traffic we see, we will not just safely cross the street, but we will also have successfully practiced data assimilation. Of course, that sounds different when researchers try to explain how data assimilation helps them. Meteorologists, for example, have been working with data assimilation for years. The German Weather Service writes, “In numerical weather prediction, data assimilation is the approximation of a model run to the actual development of the atmosphere as described by existing observations.” What it means is that a weather forecast is only accurate if the model which is used for its calculation is repeatedly updated, i.e. assimilated, with new measurement data. In 2017 an entire Collaborative Research Center was established at the University of Potsdam, CRC 1294, to deal with the mathematical basics of data assimilation. For Portal Wissen, we asked the mathematicians and speakers of the CRC Prof. Sebastian Reich and Prof. Wilhelm Huisinga how exactly data assimilation works and in which areas of research they can be used profitably in the future. We have looked at two projects at the CRC itself: the analysis of eye movements and the research on space weather. In addition, the current issue is full of research projects that revolve around data in very different ways. Atmospheric physicist Markus Rex throws a glance at the spectacular MOSAiC expedition. Starting in September 2019, the German research icebreaker “Polarstern” will drift through the Arctic Ocean for a year and collect numerous data on ice, ocean, biosphere, and atmosphere. In the project “TraceAge”, nutritionists will use the data from thousands of subjects who participated in a long-term study to find out more about the function of trace elements in our body. Computer scientists have developed a method to filter relevant information from the flood of data on the worldwide web so as to enable visually impaired to surf the Internet more easily. And a geophysicist is working on developing an early warning system for volcanic eruptions from seemingly inconspicuous seismic data. Not least, this issue deals with the fascination of fire and ice, the possibilities that digitization offers for administration, and the question of how to inspire children for sports and exercise. We hope you enjoy reading – and if you send us some of your reading experience, we will assimilate it into our next issue. Promised!

Aus dem Inhalt: - Unter einem Dach: Lehrerbildung und Bildungsforschung - Waldweit - Nicht ohne Eisen und Schwefel

Sprache ist das vielleicht universellste Werkzeug, über das wir Menschen verfügen. Mit ihr können wir uns ausdrücken und mitteilen, verständigen und verstehen, helfen und Hilfe bekommen, ein Miteinander schaffen und daran teilhaben. Doch damit ist der Wert von Sprache keineswegs vollständig erfasst. „Die Sprache gehört zum Charakter des Menschen“, meinte der englische Philosoph Sir Francis Bacon. Und glaubt man dem Dichter Johann Gottfried von Herder, ist der Mensch gar „Mensch nur durch Sprache“. Das bedeutet letztlich, wir sind in der Welt nicht mit, sondern in Sprache. Wir beschreiben unsere Wirklichkeit nicht allein mithilfe sprachlicher Mittel, Sprache ist die Brille, durch die wir uns die Welt überhaupt erschließen. Sie ist immer schon da und prägt uns und die Weise, wie wir alles um uns herum wahrnehmen und analysieren, beschreiben und letztlich auch bestimmen. Derart tief mit dem Wesen des Menschen verbunden, wundert es kaum, dass unsere Sprache seit jeher im Fokus wissenschaftlicher Forschung steht. Und zwar nicht nur jener, die sich dem Namen nach als Sprachwissenschaft zu erkennen gibt. Philosophie und Medienwissenschaft, Neurologie und Psychologie, Informatik und Semiotik – sie alle gehen sprachlichen Strukturen, ihren Voraussetzungen und ihren Möglichkeiten nach. Seit Juli 2017 arbeitet an genau dieser Schnittstelle an der Universität Potsdam ein wissenschaftliches Netzwerk: der von der Deutschen Forschungsgemeinschaft (DFG) geförderte Sonderforschungsbereich „Grenzen der Variabilität in der Sprache“ (SFB 1287). Gemeinsam untersuchen darin Linguisten, Informatiker, Psychologen und Neurologen, wo Sprache flexibel ist – und wo nicht. Dadurch hoffen sie, nicht nur mehr über einzelne Sprachen herauszufinden, sondern auch, was sie verbindet. In der vorliegenden Ausgabe der Portal Wissen haben wir die Sprecherin des SFB Isabell Wartenburger und ihrem Stellvertreter Malte Zimmermann gebeten, mit uns ins Gespräch zu kommen – über Sprache, ihre Variabilität, deren Grenzen und wie man beides erforscht. Außerdem haben wir zwei Wissenschaftlerinnen bei der Arbeit an ihren Teilprojekten über die Schulter geschaut: Die Germanistin Heike Wiese untersucht mit ihrem Team, ob auf einem Berliner Wochenmarkt, wo Sprachen aus fast allen Teilen der Welt zu hören sind, aus einem wilden Durcheinander eine neue Sprache mit eigenen Regeln entsteht. Und die Linguistin Doreen Georgi begibt sich auf eine typologische Weltreise, bei der sie rund 30 Sprachen miteinander vergleicht, um herauszufinden, ob sie gemeinsame Grenzen haben. Zugleich wollen wir auch auf andere Forschungsprojekte an der Universität Potsdam und die Menschen dahinter zu sprechen kommen. So ließ uns ein Mathematiker erkennen, was Fußball mit Mathematik zu tun hat und warum diese Verbindung in der Schule gut ankommt. Außerdem sprachen wir mit einer Anglistin über afroamerikanische Literatur im 19. Jahrhundert, führte uns ein Chemiker durch das Gebiet der Angewandten Analytischen Photonik und eine Juristin erklärte uns den Unterschied zwischen dem französischen und dem deutschen Strafrecht. Wir diskutierten mit zwei Medienwissenschaftlern und einem Religionswissenschaftler über Computer- und Videospiele von ihren Anfängen bis heute und lernten von den Gründern des Start-ups „visionYOU“, wie sich Unternehmertum mit sozialer Verantwortung verbinden lässt. In vielen weiteren Gesprächen ging es unter anderem um Fernsehen 4.0, Artenvielfalt und ökologische Dynamik, ein Training zum achtsamen Essen, die effektive Produktion von Antikörpern und die Frage, ob uns die Dauernutzung von Smartphones am Ende sprachlos macht. Aber keine Angst: Uns sind die Worte nicht ausgegangen – das Heft ist voll davon! Viel Vergnügen beim Lesen! Die Redaktion

Energy – there is something to it. There is, of course, the matter-of-fact definition in every student encyclopedia: “the capacity to do mechanical work, transfer heat, or emit light.” In this way, energy accompanies us, often undetected, all day long: getting out of bed, turning on the heat, switching on the lights, taking a hot shower, getting dressed, making coffee, having breakfast – before we have even left the house, we have already released, transformed, applied, and refueled a lot of energy. And we haven’t even worked, at least not in the traditional sense. But energy is not just a physical quantity that, due to its omnipresence, plays a key role in every natural science discipline, such as biology and chemistry, but also in almost every technical field. It is also indispensable when it comes to how we understand and describe our world and our activities – and it has been for a long time. How about an example? The Greek philosopher Aristotle was the first to speak of enérgeia, for him a rather nonphysical thing, a living “reality and effectiveness ” – that which makes the possible real. About 2,100 years later, the uncrowned king of German literature Johann Wolfgang von Goethe declared it to be a humanistic essence. “What can we call our own if not energy, strength, and will!” And for his contemporary Wilhelm von Humboldt, energy “was the human’s first and only virtue”. Although physics began to dominate the concept of energy when it became the leading science in the 19th century, energy remained significant in many areas. Reason enough for us to take a look at energy-related matters at the University of Potsdam. We found them in a wide range of disciplines: While Iranian physicist Safa Shoaee is researching how organic materials can be used to manufacture the solar cells of the future, Swedish environmental researcher Johan Lilliestam is focusing on the different dimensions of the energy transition to learn what makes it successful. Slavicist Susanne Strätling, on the other hand, crosses the boundaries of her discipline as she examines a complex conceptual history and tries to find out why energy electrifies us today more than ever. And physicist Markus Gühr is able to use ultrashort flashes of light to investigate how molecules change under its influence and convert energy in the process. Of course, we have enough energy to highlight the diversity of research at the University of Potsdam besides the feature topic of this issue. A cognitive researcher, for example, explains why our brain processes both music and language according to its own respective rhythm, while an environmental researcher presents a method that uses particles from outer space to measure soil moisture. Educational researchers have also launched a study on hate speech in schools and we introduce a palaeoclimatologist who is one of twelve researchers in the new postdoc program at the University of Potsdam. We have spared no energy!