What makes humans human – and what distinguishes them from other creatures on Earth – has long been fervently discussed and is still being discussed today. “Homo sapiens”, the scientific self-description of our species, is already the characterization as an “understanding, wise, knowledgeable human being”. It could be argued that we owe this additional knowledge to our trait of (basically) feeling particularly attached to our equals. We are what we are, above all, and perhaps even exclusively: together. The development that eventually turned communities into societies in the course of which culture and knowledge emerged, could well be told as a story of more and less togetherness. People were always successful when they lived with instead of against each other. Things that were much admired later came into being when people worked together, knowledge that made history as progress was developed by minds that came into a conversation. It is therefore all the more surprising that this “recipe for success” is being pushed into the background at a time when it is needed more than ever. As a result of the Corona pandemic, we are living in a time in which the world is faced with a – literally – all-encompassing task which it can only overcome together, as has already been said many times. And yet, many people are primarily concerned about their own well-being in various ways – not infrequently without reflecting that the well-being of many others, and possibly ultimately even their own, suffers as a consequence. When there is a need for more togetherness while there is a lot of talk about division, it becomes clear that the success of togetherness is not a foregone conclusion: If we want to achieve something together, we must always keep talking about the goals and the way to get there. For this issue, we have collected what people can achieve together and how research is trying to fathom the “secret of togetherness” in many ways. We visited a team of environmental scientists who are developing forest gardens together with committed residents – as green oases in the middle of cities. We took a first look at the prototype of a national education platform that will bundle all kinds of digital learning in the future. We also present a model project that aims to help teachers and students prevent hate speech. Last but not least, the issue presents a small selection of various collaborations across disciplinary and national borders: We show how researchers from law and political science are working together to examine the ups and downs of international law, and why religious studies scholars from Potsdam and Iraq benefit from each other. Of course, the issue also brings together the entire spectrum of research at the University of Potsdam, we promise! We found out how heavy rain turn into flash floods and how to prepare for such events. We interviewed a migration researcher and visited a geoscientist who is drawn to mountains and valleys alike. It’s about – often unwritten – “body rules” in everyday life, the exploration of our gaze with the help of artificial intelligence, 33 answers full of complexity, and about mathematics at infinity. Enough words. Read for yourself – alone or together. Just as you like!

Change makes everything different. Let’s be honest: Just about everything is constantly in transformation. Even huge massifs that seem like eternity turned to stone will eventually dissolve into dust. So is change itself the only constant? The Greek philosopher Heraclitus certainly thought so. He said, “The only thing that is constant is change.” Change is frightening. A change that we cannot explain throws us into turmoil – like a magic trick we cannot decipher. Viruses that mutate, ecosystems that collapse, stars that perish – they all seem to threaten the fragile balance that makes our existence possible. Humanity is late in recognizing that we ourselves are all too often the impetus for dangerous transformations. Change gives hope. People have always been fascinated by change and felt compelled to explore its origin and essence. Quite successfully. We understand many things much better than generations before. But well enough? Not at all. Alexander von Humboldt said, “Every law of nature that reveals itself to the observer suggests a higher, as yet unrecognized one.” There is still much to be done. The current issue of Portal Wissen is all about change. We spoke to an astrophysicist who has found her happiness in researching the formation and change of stars. We also look at different aspects of the very earthly climate change and its consequences: A geoscientist explains how global warming affects the stability of mountain ranges. A legal expert makes clear that the call for a right to climate protection has gone largely unheard until now. How human land use affects biodiversity is being investigated by young researchers of the “Bio- Move” research training group, who have provided us with insights into their work on brown hares, water fleas, and mallard ducks. Other researchers focus on change in the contexts of humans. A group of nutrition scientists at the German Institute of Human Nutrition (DIfE) and sports scientists at the University of Potsdam are investigating the factors that cause our bodies to change as we age – and why some people lose muscles more quickly than others. Despite all these changes, we do not lose sight of the diversity of research at the University of Potsdam. A visit to the laboratory of the project “OptiZeD” gives us an idea of the possibilities offered by optical sensors for the personalized medicine of tomorrow, while an educational researcher explains why cultural diversity is an asset beneficial to our education. In addition, a cultural scientist reports on the fascination of comics. They are all part of the hopeful change that science is initiating and accomplishing! Enjoy the read!

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!

For a long time, there were things on this planet that only humans could do, but this time might be coming to an end. By using the universal tool that makes us unique – our intelligence – we have worked to eliminate our uniqueness, at least when it comes to solving cognitive tasks. Artificial intelligence is now able to play chess, understand language, and drive a car – and often better than we. How did we get here? The philosopher Aristotle formulated the first “laws of thought” in his syllogisms, and the mathematicians Blaise Pascal and Wilhelm Leibniz built some of the earliest calculating machines. The mathematician George Boole was the first to introduce a formal language to represent logic. The natural scientist Alan Turing created his deciphering machine “Colossus,” the first programmable computer. Philosophers, mathematicians, psychologists, and linguists – for centuries, scientists have been developing formulas, machines, and theories that were supposed to enable us to reproduce and possibly even enhance our most valuable ability. But what exactly is “artificial intelligence”? Even the name calls for comparison. Is artificial intelligence like human intelligence? Alan Turing came up with a test in 1950 to provide a satisfying operational definition of intelligence: According to him, a machine is intelligent if its thinking abilities equal those of humans. It has to reach human levels for any cognitive task. The machine has to prove this by convincing a human interrogator that it is human. Not an easy task: After all, it has to process natural language, store knowledge, draw conclusions, and learn something new. In fact, over the past ten years, a number of AI systems have emerged that have passed the test one way or another in chat conversations with automatically generated texts or images. Nowadays, the discussion usually centers on other questions: Does AI still need its creators? Will it not only outperform humans but someday replace them – be it in the world of work or even beyond? Will AI solve our problems in the age of all-encompassing digital networking – or will it become a part of the problem? Artificial intelligence, its nature, its limitations, its potential, and its relationship to humans were being discussed even before it existed. Literature and film have created scenarios with very different endings. But what is the view of the scientists who are actually researching with or about artificial intelligence? For the current issue of our research magazine, a cognitive scientist, an education researcher, and a computer scientist shared their views. We also searched the University for projects whose professional environment reveals the numerous opportunities that AI offers for various disciplines. We cover the geosciences and computer science as well as economics, health, and literature studies. At the same time, we have not lost sight of the broad research spectrum at the University: a legal expert introduces us to the not-so-distant sphere of space law while astrophysicists work on ensuring that state-of-the-art telescopes observe those regions in space where something “is happening” at the right time. A chemist explains why the battery of the future will come from a printer, and molecular biologists explain how they will breed stress-resistant plants. You will read about all this in this issue as well as about current studies on restless legs syndrome in children and the situation of Muslims in Brandenburg. Last but not least, we will introduce you to the sheep currently grazing in Sanssouci Park – all on behalf of science. Quite clever! Enjoy your read! THE EDITORS

Language is perhaps the most universal tool of human beings. It enables us to express ourselves, to communicate and understand, to help and get help, to create and share togetherness. However, that does not completely capture the value of language. “Language belongs to the character of man,” said the English philosopher Sir Francis Bacon. If you believe the poet Johann Gottfried von Herder, a human is “only a human through language”. Ultimately, this means that we live in our world not with, but in, language. We not only describe our reality by means of language, but language is the device through which we open up the world in the first place. It is always there and shapes and influences us and the way we perceive, analyze, describe and ultimately determine everything around us. Since it is so deeply connected with human nature, it is hardly surprising that our language has always been in the center of academic research – and not only in those fields that bear the name linguistics. Philosophy and media studies, neurology and psychology, computer science and semiotics – all of them are based on linguistic structures and their premises and possibilities. Since July 2017, a scientific network at the University of Potsdam has been working on exactly this interface: the Collaborative Research Center “Limits of Variability in Language” (SFB 1287), funded by the German Research Foundation (DFG). Linguists, computer scientists, psychologists, and neurologists examine where language is or is not flexible. They hope to find out more about individual languages and their connections. In this issue of Portal Wissen, we asked SFB spokeswoman Isabell Wartenburger and deputy spokesman Malte Zimmermann to talk about language, its variability and limits, and how they investigate these aspects. We also look over the shoulders of two researchers who are working on sub-projects: Germanist Heike Wiese and her team examine whether the pandemonium of the many different languages spoken at a weekly market in Berlin is creating a new language with its own rules. Linguist Doreen Georgi embarks on a typological journey around the world comparing about 30 languages to find out if they have common limits. We also want to introduce other research projects at the University of Potsdam and the people behind them. We talk to biologists about biodiversity and ecological dynamics, and the founders of the startup “visionYOU” explain how entrepreneurship can be combined with social responsibility. Other discussions center round the effective production of antibodies and the question of whether the continued use of smartphones will eventually make us speechless. But do not worry: we did not run out of words – the magazine is full of them! Enjoy your reading! The Editors