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“They Took to the Sea”
(2023)
The sea and maritime spaces have long been neglected in the field of Jewish studies despite their relevance in the context of Jewish religious texts and historical narratives. The images of Noah’s arche, king Salomon’s maritime activities or the miracle of the parting of the Red Sea immediately come into mind, however, only illustrate a few aspects of Jewish maritime activities. Consequently, the relations of Jews and the sea has to be seen in a much broader spatial and temporal framework in order to understand the overall importance of maritime spaces in Jewish history and culture.
Almost sixty years after Samuel Tolkowsky’s pivotal study on maritime Jewish history and culture and the publication of his book “They Took to the Sea” in 1964, this volume of PaRDeS seeks to follow these ideas, revisit Jewish history and culture from different maritime perspectives and shed new light on current research in the field, which brings together Jewish and maritime studies.
The articles in this volume therefore reflect a wide range of topics and illustrate how maritime perspectives can enrich our understanding of Jewish history and culture and its entanglement with the sea – especially in modern times. They study different spaces and examine their embedded narratives and functions. They follow in one way or another the discussions which evolved in the last decades, focused on the importance of spatial dimensions and opened up possibilities for studying the production and construction of spaces, their influences on cultural practices and ideas, as well as structures and changes of social processes. By taking these debates into account, the articles offer new insights into Jewish history and culture by taking us out to “sea” and inviting us to revisit Jewish history and culture from different maritime perspectives.
Portal Wissen = Together
(2022)
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!
Portal Wissen = Time
(2014)
“What then is time?”, Augustine of Hippo sighs melancholically in Book XI of “Confessions” and continues, “If no one asks me, I know; if I want to explain it to a questioner, I don’t know.” Even today, 1584 years after Augustine, time still appears mysterious. Treatises about the essence of time fill whole libraries – and this magazine.
However, questions of essence are alien to modern sciences. Time is – at least in physics – unproblematic: “Time is defined so that motion looks simple”, briefly and prosaically phrased, waves goodbye to Augustine’s riddle and to the Newtonian concept of absolute time, whose mathematical flow can only be approximately recorded with earthly instruments anyway.
In our everyday language and even in science we still speak of the flow of time but time has not been a natural condition for quite a while now. It is rather a conventional order parameter for change and movement. Processes are arranged by using a class of processes as a counting system in order to compare other processes and to organize them with the help of the temporary categories “before”, “during”, and “after”.
During Galileo’s time one’s own pulse was seen as the time standard for the flight of cannon balls. More sophisticated examination methods later made this seem too impractical. The distance-time diagrams of free-flying cannon balls turned out to be rather imprecise, difficult to replicate, and in no way “simple”. Nowadays, we use cesium atoms. A process is said to take one second when a caesium-133 atom completes 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state. A meter is the length of the path travelled by light in a vacuum in exactly 1/299,792,458 of a second. Fortunately, these data are hard-coded in the Global Positioning System GPS so users do not have to reenter them each time they want to know where they are. In the future, however, they might have to download an app because the time standard has been replaced by sophisticated transitions to ytterbium.
The conventional character of the time concept should not tempt us to believe that everything is somehow relative and, as a result, arbitrary. The relation of one’s own pulse to an atomic clock is absolute and as real as the relation of an hourglass to the path of the sun. The exact sciences are relational sciences. They are not about the thing-initself as Newton and Kant dreamt, but rather about relations as Leibniz and, later, Mach pointed out.
It is not surprising that the physical time standard turned out to be rather impractical for other scientists. The psychology of time perception tells us – and you will all agree – that the perceived age is quite different from the physical age. The older we get the shorter the years seem. If we simply assume that perceived duration is inversely related to physical age and that a 20-year old also perceives a physical year as a psychological one, we come to the surprising discovery that at 90 years we are 90 years old. With an assumed life expectancy of 90 years, 67% (or 82%) of your felt lifetime is behind you at the age of 20 (or 40) physical years.
Before we start to wallow in melancholy in the face of the “relativity of time”, let me again quote Augustine. “But at any rate this much I dare affirm I know: that if nothing passed there would be no past time; if nothing were approaching, there would be no future time; if nothing were, there would be no present time.” Well, – or as Bob Dylan sings “The times they are a-changin”.
I wish you an exciting time reading this issue.
Prof. Martin Wilkens
Professor of Quantum Optics
Portal Wissen = small
(2016)
Let’s be honest: even science wants to make it big, at least when it comes to discovering new knowledge. Yet if one thing belongs in the annals of successful research, it is definitely small things. Scientists have long understood that their job is to explore things that they don’t see right away. Seneca once wrote, “If something is smaller than the great, this does not mean at all that it is insignificant.”
The smallest units of life, such as bacteria or viruses, can often have powerful effects. And again and again, (seemingly) large things must first be disassembled or reduced to small pieces in order to recognize their nature. One of the greatest secrets of our world – the atom, the smallest, if no longer indivisible, unit of chemical elements – revealed itself only by looking at its diminutive size. By no means is ‘small’ (German: klein) merely a counterpoint to large, at least in linguistic terms; the word comes from West Germanic klaini, which means ‘fine’ or ‘delicate,’ and is also related to the English word ‘clean.’ Fine and clean – certainly something worth striving for in scientific work. And a bit of attention to detail doesn’t hurt either.
This doesn’t mean that researchers can be smallminded; they should be ready to expect the unexpected and to adjust their work accordingly. And even if they cannot attain their goals in the short term, they need staying power to keep themselves from being talked down, from giving up.
Strictly speaking, research is like putting together a puzzle with tons of tiny pieces; you don’t want it to end. Every discovery worthy of a Nobel Prize, every major research project, has to start with a small idea, with a tiny spark, and then the planning of the minutest details can begin. What follows is work focused on minuscule details: hours of interviews searching for the secret of the cerebellum (Latin for ‘little brain’), days of field studies searching for Lilliputian forms of life, weeks of experimentation meant to render visible the microscopically tiny, months of archival research that brings odds and ends to light, or years of reading fine print. All while hunting for a big hit...
This is why we’ve assembled a few ‘little’ stories about research at the University of Potsdam, under the motto: small, but look out! Nutritional scientists are working on rescuing some of the earth’s smaller residents – mice – from the fate of ‘lab rats’ by developing alternatives to animal testing. Linguists are using innovative methods in several projects to investigate how small children learn languages. Astrophysicists in Potsdam are scanning the skies above Babelsberg for the billions of stars in the Magellan Cloud, which only seem tiny from down here. The Research Center Sanssouci, initiated by the Prussian Palaces and Gardens Foundation and the University of Potsdam, is starting small but will bring about great things for Potsdam’s cultural landscape. Biologists are drilling down to the smallest building blocks of life, looking for genes in barley so that new strains with positive characteristics can be cultivated.
Like we said: little things. Have fun reading!
The Editorial
Portal Wissen = Signs
(2015)
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
Portal Wissen = rich
(2017)
The current Issue of Portal Wissen is entitled “reich”, a German word with several meanings. Both an adjective and a noun, it can be translated as rich, wealthy, and abundant, or realm, empire, and kingdom. It is also part of words like Reichtum (wealth, fortune), Reichweite (reach, scope), lehrreich (informative, instructive) and ruhmreich (glorious, renowned*).
Realms – a complex subject. While the worldly empires of mankind come and go, even if they often claim the opposite, and the eternal existence of the kingdom of heaven has not been credibly proven, another and much older realm has an almost inexhaustible wealth – the animal and plant kingdom.
Speaking of wealth: Some people are rich and want to stay rich at any price. Others still want to become rich and are looking for a path to wealth – some for the fastest, some for the easiest, and some for the perfect path. There are even people who want to leave nothing to chance and use a scientific approach, for example the American author Wallace D. Wattles, who published the book The Science of Getting Rich in 1903. His essay was intended for “for the men and women whose most pressing need is for money; who wish to get rich first, and philosophize afterward.” He was so convinced of his work that he even offered a guarantee of success. Anyone who followed his manual would “undoubtedly become rich because the science that is used here is an exact science, and failure is impossible.”
Wattles has been almost forgotten, but the secret of wealth – at least financial wealth – seems anything but deciphered. Some have got it, others want it. There are worlds in between – as well as envy, prejudices and ignorance. More than enough reason for us to look again at Wallace D. Wattles and his self-confidently presented alleged relationship between wealth and science, and to say: Yes! Of course, science makes us rich, but primarily rich in perception, experience and – in knowledge. Science in itself is not glorious but instructive. The great thing is: All can equally benefit from the wealth created by science at the same time. Nobody has to get rich at the expense of others, on the contrary: You can often achieve much more together with others. Everything else comes (almost) by itself. “Those who acquire knowledge are richly rewarded by God,” is the religiously informed praise of sciences by the Islamic prophet Muhammad.
The current issue of the Portal Wissen, however, focuses on facts, which is admittedly not in style at the moment. We therefore invite you to a tour of the University of Potsdam and its partners. It is about studies on the rich biodiversity of porpoises and lab mice. We present a historian who studies rich church treasures and talk with an education researcher about the secret of financial wealth. German philologists explain the rich language of literary criticism in the era of Enlightenment, and we follow a geo-scientist into the mountains where he moved large boulders to find the right stones. It is also about the cities of tomorrow, which have many high-rise buildings but are still (rich in) green, abundant water from once-in-acentury flash floods, and insects as an alternative to a rich diet of tomorrow. We take you to the border area of two disciplines where law and philosophy work hand in hand, talk with two literary scholars who are studying the astounding reach of the Schlager phenomenon of traditional German-language pop music, and learn from a sustainability researcher how to work together to achieve long-term solutions for pressing global problems.
We wish you a pleasant read!
The Editors
Portal Wissen = Point
(2016)
A point is more than meets the eye. In geometry, a point is an object with zero dimensions – it is there but takes up little space. You may assume that something so small is easily overlooked. A closer look reveals that points are everywhere and play a significant role in many areas. In physics, for example, a mass point is the highest possible idealization of a body, which is the theoretical notion that the entire mass of a body is concentrated in a point, its “center of mass”.
Points are at the beginning (starting points), at intersections (pivot points), and at the end (final points). A point symbolizes great precision. There is a reason we “get to the point”. In writing, a point abbreviates, structures, and finalizes what is said. Physicians puncture, and athletes collect points on playing fields, courses, and on tables.
It’s no wonder that researchers are “surrounded” by points and work with them every day: Points bring order to chaos, structure the unexplained, and name the nameless. A point is often the beginning, an entry to worlds, findings, or problems.
Points are for everyone, though. German mathematician Oskar Perron wrote, “A point is exactly what the intelligent yet innocent, uncorrupted reader imagines it to be.” We want to follow up on this quotation: The latest edition of Portal Wissen offers exciting starting points, analyzes points of view, and gets right to the point.
We follow a physicist to the sun – the center point of our solar system – to ponder the origin of solar eruptions. We talked to a marketing professor about turning contentious points into successful deals during negotiation. Business information experts present leverage points that prepare both humans and machines for factories in the age of Industry 4.0. Enthusiastic entrepreneurs show us how their research became the starting point of a successful business idea – and also make the world a bit better. Geoscientists explain why the weather phenomenon El Niño causes – wet and dry – flashpoints. Just to name a few of many points …
We hope our magazine scores points with you and wish you an inspiring read!
The Editorial
Portal Wissen = Paths
(2015)
How traits are inherited from one generation to the next, how mutations change genetic information and consequently contribute to the development of new characteristics and emergence of new species – all these are exciting biological questions. Over millions of years, genetic differentiation has brought about an incredible diversity of species. Evolution has followed many different paths. It has led to an awesome natural biodiversity – to organisms that have adapted to very different environments and are sometimes oddly shaped or behave strangely. Humanmade biodiversity is stunning, too. Just think of the 10,000 rose varieties whose beauty delights, or the myriad wheat, barley, and corn variations; plants that had all once been plain grasses feed us today. We humans create our own biodiversity unknown to nature. And it is serving us well.
Thanks to genome research we are now able to read the complete genetic information of organisms within a few hours or days. It takes much longer, however, to functionally map the many genomic sequences. Researchers achieve this through various methods: Activating or deactivating genes systematically, modifying their code, and exchanging genetic information between organisms have become standard procedures worldwide. The path to knowledge is often intricate, though. Elaborate experimental approaches are often necessary to gain insight into biological processes.
Methods of genomic research enable us to investigate not only what is “out there” in nature, but also to ask, “How does a living organism, like a moss, react when sent to the International Space Station (ISS)? Can we gain knowledge about the adaptation strategies of living beings in harsh environmental conditions or even for colonizing the Moon or Mars?” Can we use synthetic biology to precisely alter microorganisms, planned on a drawing board so to speak, to create new options for treating diseases or for making innovative biology-based products? The answer to both questions is a resounding Yes! (Although moving to other planets is not on our present agenda.) Human land use determines biodiversity. On the other hand, organisms influence the formation of landscapes and, sooner or later, the composition of our atmosphere. This also leads to exciting scientific questions. Researchers have to strike new paths to reach new conclusions. Paths often cross other paths. A few years ago it was still unforeseeable that ecological research would substantially benefit from fast DNA sequencing methods. Genome researchers could hardly assume that the same techniques would lead to new possibilities for examining the highly complex cellular regulation and optimizing biotechnological processes.
You will find examples of the multi-faceted research in biology as well as other very interesting articles in the latest edition of Portal Wissen. I wish you an enjoyable read!
Prof. Dr. Bernd Müller-Röber
Professor of Molecular Biology
Portal Wissen = Layers
(2013)
The latest edition of our Potsdam Research Magazine “Portal Wissen” addresses the topic “Layers” in many different ways. Geoscientists often deal with layers: layers of soil, sediment, or rock are the evidence of repeated and long-lasting processes of erosion and sedimentation that took place in the early history of the earth. For instance, mountains are eroded by water, ice and wind. The sand that results from that erosion might eventually form a new layer on the ocean floor known as a sediment horizon. After tens of millions of years, tectonic plate movements can deform the ocean floor, pushing it upwards as mountains are created, bringing the layers of sand from former mountain chains together with fossilized sea dwellers into the realm of climbers and mountaineers – a fundamental cycle within the Earth system that was succinctly described by Ibn Sina nearly 1000 years ago, and later by Charles Darwin when he was crossing the Andes.
The landscape around us overlays the products of recent processes with those from the past. Slow processes or extreme events that happen very rarely – like floods, earthquakes or rockslides – wipe out certain characteristics, while others remain on the surface. In this sense, the landscape is like a palimpsest – a piece of parchment that monks in the Middle Ages scraped clean again and again to write something new. Analysing rock layers and soil is similar to the work of a detective. Geophysical deep sounding with sound and radar waves, precise measurements of motions related to earthquakes, and deep boreholes each provide a glimpse of the characteristics of what lies beneath us, giving us a better understanding of spatial distribution of the various layers. Fossils can tell us the age of a layer of sediment, while radiometric isotopes in minerals reveal how quickly a rock moved from deep within the Earth up to the surface, perhaps during the process of mountain building. Thin layers of ash tell us when there was a devastating volcanic eruption that influenced environmental conditions. The shape, gradation, and surface conditions of sand grains reflect whether wind or water was responsible for their transport. We know, for instance, that northern Germany was a desert landscape more than 260 million years ago. At that time, the wind made huge dunes migrate across the region. Over time, climate and vegetation slowly alter the physical and chemical characteristics of sand and rock at the surface, turning them into soil, the epidermis of our planet. Mineralogical analyses of layers of the soil layer tell us whether the climate was dry or wet. These kinds of observations allow us to reconstruct links between our climate system and processes that have taken place on the Earth’s surface, as well as those processes that originate at much deeper levels. The clues we use might be hidden under the surface of the earth or clearly visible on the surface, like in the mountains, or even in freshly cut rock alongside roads.
On the following pages, we invite you to accompany scientists from Potsdam into their world of research. They track hidden traces of longgone earthquakes in the Tien Shan Mountains; they discover ancient forms of life in deep-sea sediments. They even examine layers in outer space that can tell us something about the formation of planets. “Portal Wissen” not only presents scientists of the University of Potsdam who deal with the sequence of layers formed by solid rock, but also those scientists who deal with levels of education or social strata. Research scientists explain how to implement the social mission of inclusion in teaching, and how pupils from the Berlin district Kreuzberg examine language in urban neighbourhoods together with students from the University of Potsdam.
Although these types of “layers” are very different, they all have something in common. Their structure and profile are evidence of continuously changing conditions. The present will leave traces and layers that future geoscientists will measure and examine. We already speak of the Anthropocene, a geological era dominated by humans, which is characterized by far-reaching changes in erosion and sedimentation rates, and the displacement of natural habitats. I hope that you will discover exciting and inspiring stories in this edition. And remember – it is always worth having a look beneath the surface.
Prof. Manfred Strecker, PHD
Professor of Geology
Portal Wissen = Language
(2018)
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