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Why Did Early Humans Prefer to Hunt Near Water Sources?

Elephant Hunting and Stone Quarries in the Paleolithic Era

Archaeologists from Tel Aviv University have uncovered the mystery surrounding extensive Paleolithic stone quarrying and tool-making sites: Why did Homo erectus repeatedly revisit the very same locations for hundreds of thousands of years? The answer lies in the migration routes of elephants, which they hunted and dismembered using flint tools crafted at these quarrying sites.

The research was led by Dr. Meir Finkel and Prof. Ran Barkai of Tel Aviv University’s Jacob M. Alkow Department of Archaeology and Ancient Near Eastern Cultures. The study was published in the journal Archaeologies.

Prof. Ran Barkai.

Prof. Ran Barkai explains: “Ancient humans required three things: water, food, and stone. While water and food are necessities for all creatures, humans relied on stone tools to hunt and butcher animals, as they lacked the sharp claws or fangs of other predators. The question is, why do we find rock outcrops that were used for the production of flint tools, surrounded by thousands of stone tools, and next to them rock outcrops containing flint that was not used for the production of tools? A study of indigenous groups that lived until recently, with some still alive today, shows that hunter-gatherers attribute great importance to the source of the stone — the quarry itself — imbuing it with potency and sanctity, and hence also spiritual worship. People have been making pilgrimages to such sites for generations upon generations, leaving offerings at the rock outcrop, while adjacent outcrops, equally suitable for stone tool production, remain untouched. We sought to understand why; what is special about these sites?”

How did elephant migration routes affect prehistoric quarry locations?

For nearly 20 years, Prof. Barkai and his colleagues have been researching flint quarrying and tool-making sites in the Upper Galilee. These sites are characterized by large nodules of flint convenient for crafting and are located within walking distance of the major Paleolithic sites of the Hula Valley — Gesher Benot Ya’akov and Ma’ayan Baruch. These sites boast thousands of quarrying and extraction localities where, until half a million years ago, in the Lower Paleolithic period, prehistoric humans fashioned tools and left offerings, despite the presence of flint in other geological formations in various places. Because elephants were the primary dietary component for these early humans, the Tel Aviv University researchers cross-referenced the database of the sites’ distribution with the database of the elephants’ migration routes and discovered that the flint quarrying and knapping sites were situated in rock outcrops near the elephants’ migration paths.

“An elephant consumes 400 liters of water a day on average, and that’s why it has fixed movement paths,” says Dr. Finkel. “These are animals that rely on a daily supply of water, and therefore on water sources — the banks of lakes, rivers and streams. In many instances, we discover elephant hunting and processing sites at “necessary crossings” — where a stream or river passes through a steep mountain pass, or when a path along a lakeshore is limited to the space between the shore and a mountain range. At the same time, given the absence of available means of preservation and the presence of predatory animals in the area, the window of opportunity for a group of hunter-gatherers to exhaust their elephant prey was limited. Therefore, it was imperative to prepare suitable cutting tools in large quantities in advance and nearby. For this reason, we find quarrying and knapping sites in the Upper Galilee located a short distance from elephant butchering sites, which are positioned along the elephants’ movement paths.”

Quarries and flint piles in the Galilee (Photo: Meir Finkel).

Subsequently, the researchers sought to apply an adapted model from the one they developed in Israel to several sites from the Lower Paleolithic period in Asia, Europe and Africa, where such a “triad” exists. These included both sites where the hunted animals were elephants or mammoths, as well as later sites where other animals, such as hippos, camels, and horses, were the prey.

“It appears that the Paleolithic holy trinity holds true universally: Wherever there was water, there were elephants, and wherever there were elephants, humans had to find suitable rock outcrops to quarry stone and make tools in order to hunt and butcher their favorite megaherbivores”, says Prof. Barkai.

“It was a tradition: For hundreds of thousands of years, the elephants wandered along the same route, while humans produced stone tools nearby. Ultimately, those elephants became extinct, and the world changed forever” – Prof. Barkai.

Main Tel Aviv University Stays Committed to Furthering Internationalization

TAU delegation participates in NAFSA 2024

From May 28 to 31, Tel Aviv University (TAU) participated in NAFSA 2024, held in New Orleans, the USA. Representing TAU were Sharon Ziv Kafri, Director of International Development; Konstantin Platonov, Director of Asia Engagement; and Roy Robinson, Director of the North American TAU Office. They joined other Israeli universities at the Study in Israel booth, showcasing the institution’s commitment to fostering global partnerships and international collaboration.

Strengthening Global Connections

NAFSA, the world’s largest association dedicated to international education, provided an ideal platform for TAU to engage with current and potential partners. TAU has been a regular participant in NAFSA for many years, and this year’s participation was particularly crucial.

“It was important for TAU to be there to continue the conversation with partners and to build new partnerships. The role of academia now more than ever is to be a bridge between countries,” — Sharon Ziv Kafri, Director of International Development

Ziv Kafri also highlighted the importance of face-to-face interactions during such times: “People really want to know how we are and what is happening at university. Being in the same location allows us to get to know our partners, network, and form new partnerships.”

Engaging with Partners Across the Globe

The TAU delegation met with existing partners from various countries, including Korea, Japan, China, India, Spain, Italy, France, Australia, Argentina, Mexico, and the USA. These meetings were pivotal in discussing the future of these partnerships and exploring ways to elevate them to the next level.

Konstantin Platonov and Sharon Ziv Kafri with representatives from Osnabrueck University in Germany 

Additionally, TAU seized the opportunity to initiate conversations with universities it has not yet partnered with. These initial discussions aimed to identify mutual areas of interest and potential collaboration.

As Konstantin Platonov comments, “We managed to build some very prospective connections and negotiate several new exchange programs with the Republic of Korea and Japan.” 

We are happy that our Asian partners are highly supportive and committed to strengthening relations with Israel.” — Konstantin Platonov, Director of Asia Engagement

Highlight Events and Discussions

NAFSA 2024 featured several events that the TAU delegation took part in. These included, for instance, the Symposium on Leadership: Reinventing Internationalization, which focused on adapting new approaches to internationalization to institutional contexts and beyond, Monash University Lunch, which addressed the current challenges of internationalization, and a Science Po Breakfast, where participants discussed managing large-scale exchange programs and Science Po’s international strategy across its campuses.

“It’s a great way to interact with people who do similar jobs and to build personal connections, which is very important.” — Sharon Ziv Kafri.

One of the important takeaways highlighted the value of building strong ties between an international office and a research authority, as they can propel internationalization efforts.

TAU representatives also attended events with Notre Dame University, Baden-Wurtenberg universities, and the State University of New York (SUNY). These gatherings were invaluable for sharing knowledge and experiences in the field of university internationalization.

Community and Collaboration

In addition to academic and professional engagements, TAU sponsored a Jewish community gathering in collaboration with other Israeli universities. This event fostered a sense of community and shared purpose among the participants, leading to the establishment of new connections. 

Israeli delegation at the Study in Israel booth at NAFSA

Platonov elaborates: “We met a representative of a prestigious Japanese university who joined the gathering because her partner is Jewish. We quickly identified several gravity points and agreed to explore institutional cooperation and student exchange.”

Looking Forward

TAU’s presence at NAFSA 2024 underscored its dedication to global engagement and academic collaboration. As the university navigates current events and challenges, such platforms remain instrumental in sustaining and expanding its international presence. TAU continues to embody the spirit of academic diplomacy, building bridges and forging partnerships that transcend borders.

Faculty of Exact Sciences Symposium: Exact Sciences: Igniting Tomorrow’s Innovations

Dr. Adi Ashkenazi from the Department of Particle Physics in the School of Physics and Astronomy

Last week, Tel Aviv University hosted the symposium, “Exact Sciences: Igniting Tomorrow’s Innovations,” attracting a packed audience. The event explored the pivotal role of TAU’s Raymond and Beverly Sackler Faculty of Exact Sciences in shaping the foundational pillars of science and technology to address 21st-century challenges.

In his opening remarks, TAU Rector Prof. Mark Shtaif emphasized the profound impact of scientific advances on society and technology.

Exact Sciences Dean Prof. Tova Milo presented the Faculty, emphasizing its remarkable standing and its commitment to excellence. She acknowledged the challenging times for students and faculty during wartime and the accelerating international academic boycott of Israel. Prof. Milo highlighted the paramount importance of both internal and external support for students and researchers to maintain a semblance of normalcy and resilience, for the sake of Israel’s future.

Eyal Waldman, recipient of the 2024 Israel Prize for Entrepreneurship and special guest speaker, shared insights during an interview with Prof. Michal Feldman from the Blavatnik School of Computer Science. Waldman expressed immense pride in receiving the award, attributing it to the collective efforts of thousands who have worked alongside him. Waldman emphasized the critical role of innovation and entrepreneurship in bolstering Israel’s economy, highlighting high-tech exports’ significant contribution. Waldman also spoke about the role of AI in our lives, noting that AI is penetrating all aspects of our existence and making technology increasingly indispensable. He discussed the need for developing smarter, faster, and more intelligent hardware to support future applications. Additionally, Waldman underscored the importance of using secure and reliable data for machine learning, as well as the obligation to prevent manipulation of AI decisions for personal benefits.

The symposium included TED talks by leading faculty members, delving into technological and scientific challenges in their respective fields. Topics ranged from “Statistics in the Age of AI” by Prof. Saharon Rosset, School of Mathematical Sciences, and “AI in 2024: What’s Current and What’s Next?” by Prof. Lior Wolf, Blavatnik School of Computer Science, to “Mobility of the Future: Challenges and New Capabilities” by Dr. Bat-hen Nahmias-Biran, Porter School of the Environment and Earth Sciences & School of Social and Policy Studies;  “Quantum Materials” by Prof. Moshe Ben Shalom, School of Physics and Astronomy; and an overview of the latest research from the School of Chemistry by Prof. Yuval Ebenstein.

 

 

Bearing Witness from the Eye of a Hurricane

Documenting tragedy and life after October 7

Documenting tragedy and life after October 7

Whether one thinks about October 7, about the ongoing war, or about the global rise in antisemitism, it’s hard not to feel in the middle of a hurricane, as Eden Golan so bravely and beautifully sang. But what does it mean to be in the middle of this tragic hurricane? And how can we bear witness to it all? 

For answers to these complicated questions, we turn to two experts from Tel Aviv University’s (TAU’s) international MFA Degree in Documentary Cinema. In the coming academic year, they will be teaching new courses touching on the relationship between documentary filmmaking and conflict. Notably, the MFA’s courses are continually updated based on the most pressing issues of our time.

Tami Liberman


Tami Liberman, a lecturer in the English-speaking documentary cinema MFA program, leads a workshop called “Ethnographic Film in Past and Present Conflicts.”

What role can documentary filmmaking play during a time of war and conflict?

In the ethnographic film workshop taught in our program, film is discussed from an anthropological perspective, as a medium that excels in providing experiential knowledge rather than analytical knowledge. Meaning, it can allow us to sense the experience of another person, at times even from the other side of a conflict we take part in.

Film can restore humanity or be a reminder of humanism in times when people are most aggressively dehumanized. Moreover, it’s a great platform for the promotion of critical thinking.

Can a documentary film made during a time of conflict ever truly be objective? Why or why not?

Objectivity is a complex and problematized expectation from documentary film at any time. I feel that the central issue in times of conflict is that of ethics: how do we get our information? In what kind of predicament are we finding our protagonists and how does that affect their consent? And when documenting a violent conflict, what can and cannot be shown on screen, and how do we document suffering?

What’s a lesson we can learn from a previous documentary about conflict or war? 

In the 2019 film Midnight Traveler, which is a self-documentation of a family’s escape from Afghanistan and their experience as asylum seekers in Europe, there is a moment that the young daughter of the family suddenly disappears. 

Her father, Hassan Fazili, the director of the film, describes in a monologue accompanied by a sombre shot of the moon in a dark sky, the harrowing moments of searching.

He describes how, when he was looking through the bushes, a flash of thought rushed through his mind: “What a scene you’re in. This will be the best scene in the film. Maybe you should turn on the camera.” 

Another glimpse of a thought follows in which, for a few seconds, he imagines finding his daughter Zahra’s body with the camera on. “How much I hated myself for that,” he says as the shot tilts down from the moon into complete darkness, “I hated cinema.” Then he adds “Zahra was found” and the film cuts from the black screen to a shot of Zahra laughing. This scene to me is such a sincere, humble and compelling lesson in documentary filmmaking, both in content and form.

I share the scene with students in my class with the hope that they not only remember the power of turning the camera on, but also the power of turning it off.

What stories need to be told right now?

I’m not sure that it’s for me to say. I can’t envision all the stories that are out there in the world waiting to be told, especially with a genre too wonderfully reliant on reality to be fully premeditated.

What’s important is that they are told and that people’s subjective experiences continue to be represented, especially in the face of attempts to control and censor such representations.

Dan Arav

Dan Arav teaches a seminar in TAU’s international documentary cinema MFA program called “Docu-trauma: War and Memory in Israeli Documentary Cinema.” 

What role can documentary filmmaking play during a time of war and conflict?

Documentary filmmaking is usually done from a certain time perspective. And yet, in the face of a long-lasting war, and certainly in the face of an ongoing conflict, documentary cinema has several roles.

Being based on the personal vision of its creators, documentary cinema must provide a personal and interpretive position in relation to the harsh reality, while placing that reality in an additional and even different context than the one mediated by the central mechanisms of consciousness in society: the government, the education system and mass media channels.

Can a documentary film made during a time of conflict ever truly be objective? Why or why not?

Documentary cinema in general, and during war in particular, must give up the pretense of being objective.

It must strive for truth and integrity, and at the same time illuminate the reality in a personal way: one that seeks to illuminate the story of the conflict from a surprising, unfamiliar and sometimes even challenging angle.

What’s a lesson we can learn from a previous documentary about conflict or war? 

It is difficult to pinpoint a lesson that can be learned in real time. As has been said, documentary cinema usually offers an opportunity for the revelation of reality and the creation of a new consciousness in relation to the past.

The documentary Censored Voices, for example, returns to the Six Day War 50 years after its occurrence and reveals an alternative discourse – a discourse that took place in real time on the margins. This discourse was censored due to its incompatibility with the prevailing discourse at that time. A film of this type, which deals with a distant and forgotten war, may, perhaps, promote an alternative way of thinking also in relation to conflicts closer in time.

What stories need to be told right now?

The stories that need to be told today are, in my opinion, personal stories, stories that go beyond the rut of consciousness dictated from above. Stories that provide a broad perspective about reality and develop critical thinking.

Connecting International Researchers with Cutting-Edge Engineering Programs and Labs

TAU’s First Prospective Student Week for Engineers

At the end of May, the TAU Faculty of Engineering hosted its first Prospective Student Week, welcoming international participants eager to explore academic and research opportunities at TAU. With a focus on graduate and postgraduate programs, the event provided a comprehensive overview of the university.

Early career researchers hailing from Italy, the US, the UK, and China met with the dean and vice deans, talked to potential academic advisors from among the faculty, toured the campus, and also walked around Tel Aviv and Yafo to get the ultimate Tel Aviv experience.

At the Forefront of Innovation

Diverse in its scope and offerings, the Faculty of Engineering stands as the largest and foremost institution of its kind in Israel, housing five schools in key areas of engineering: electrical, mechanical, industrial, biomedical, and materials science. Over 120 globally renowned scientists and engineers lead pioneering research projects across a spectrum of fields, ranging from cyber and artificial intelligence to renewable energy and nanotechnology.

One of the engineering labs

International research students can join any of the departments since all master’s and PhD-level courses are taught fully in English, so proficiency in Hebrew is not a prerequisite for enrollment. This year, the Faculty is launching two new international MSc programs in Biomedical and Environmental Engineering, which are currently accepting applications from outstanding engineering majors worldwide.

Participants of the Prospective Students Week during their Tel Aviv tour

Notably, the Faculty of Engineering offers generous scholarships to international applicants which cover the tuition fees and provide a substantial stipend aligned with the cost of living in Tel Aviv. Additionally, international PhD students and postdocs have ample opportunities to find employment on campus, such as teaching assistant positions.

Where Innovation Happens

Central to the week’s agenda were immersive lab tours, offering participants firsthand insights into the cutting-edge research underway within the Faculty of Engineering.

Prof Tal Carmon talking about his research

Prof. Tal Carmon showcased his team’s work in the field of electrical engineering, building inexpensive and easy-to-use lasers that are indispensable for submarine navigation. He also emphasized international collaborations in optics with researchers from Japan and Germany.

For Xiaoxi Xu of Foshan University, the allure of pursuing a PhD in optical engineering at TAU stems from a recommendation by her current research advisor, who fondly recalls his own tenure as a post-doctoral fellow at the university. Likewise, Huiyuan Sun, an AI engineer from China, echoes the sentiment, citing positive reviews of TAU’s academic programs.

In the Environmental Materials and Processes Lab

In Prof Ines Zucker’s lab, the participants got to learn about designing and testing materials and processes for environmental applications, the main focus of the lab. Some of the lab’s projects address issues such as water treatment using innovative absorbent materials or advanced oxidation processes. Lab researchers are also actively investigating the potential environmental risks and implications of using various nanomaterials. 

Prof. Vladimir Popov talking detailing the 3D printing process 

Introducing international students to the 3D printing lab, Prof Vladimir Popov showed the equipment the team operates to create and test metal alloys that can then be used for various purposes, including repairing jet turbine blades or printing various objects.

Finally, Prof Brian Rosen took the participants to his two labs where researchers develop unique nano-materials that allow for easier and more efficient production and storage of energy in portable fuel cells. 

Prof. Brian Rosen explains how nano-materials are used in fuel cells

For Pietro Rosatti, who is currently finishing his PhD at the University of Trento, familiarity with TAU’s research output in his field of electromagnetics solidifies his decision to explore academic opportunities at the university: “I think there is a very strong community in my field”. 

Similarly, Joshua Feldman from the University of Illinois contemplates a future in Israel, drawn by the prospect of continuing his research in mechanical engineering at TAU.

From the Lab to the Market

Concluding the lab tours, Prof. Brian Rosen, Vice Dean for International Affairs, highlighted TAU’s robust ecosystem for technology transfer and entrepreneurship. TAU faculty enjoy comprehensive support by the TAU Ventures and the Israeli Innovation Authority. Moreover, there is easy access to leading tech companies based in Tel Aviv, empowering students and faculty members to translate research insights into real-world applications. 

TAU is consistently ranked highly for entrepreneurship and is the only non-US university to enter the top 10 for the number of startups and unicorns launched by university graduates. Engineering faculty members working closely with PhD students and postdocs have established many successful startups, which is a further testament to the quality and relevance of research conducted at the faculty.  

The Prospective Student Week at TAU Faculty of Engineering successfully showcased the university’s commitment to excellence in education and research. By fostering an environment of innovation and collaboration, TAU continues to attract top talent from around the globe. With its cutting-edge facilities, distinguished faculty, and vibrant academic community, TAU stands as a beacon of engineering excellence, poised to shape the future of technology and innovation.

Learn more about open research positions,  MSc and PhD options at the Faculty of Engineering

Grand Opening: TAU’s Innovative Nanotech Frontier

TAU Proudly Opens its New Nanotech Center

Tel Aviv University pioneered the Israeli nanoscience field with the establishment of The Center for Nanoscience and Nanotechnology 

The inauguration of the Roman Abramovich Building for Nano and Quantum Science & Technology and the Jan Koum Center for Nanoscience and Nanotechnology took place during the events of the annual Board of Governors (BOG24). The new building has taken quite a route, but it was worth the wait. It is a marvel of architecture and science not just for our campus, not just for Israel, but also for the world.

From left:TAU President Prof. Ariel Porat, former TAU President Prof. Joseph Klafter, and Ms. Rola Brentlin cutting the ribbon of the Nano building entrance (photo: Israel Hadari)

“Although this journey has already gone on for ten years, today is really just the beginning. We are grateful for having played a role in seeing this center come to life, but we now look forward to seeing the progress, contributions and results that will come out of here.”  Rola Brentlin.

“Although this journey has already gone on for ten years, today is really just the beginning. We are grateful for having played a role in seeing this center come to life, but we now look forward to seeing the progress, contributions and results that will come out of here,” said Rola Brentlin, the representative of Roman Abramovich. .

TAU’s Koum Center is one of the top research institutions in Israel for nanotechnology. Its new location spans three floors and 8,000 square meters. This esteemed facility signals a new era for nanotechnology research both at TAU and generally in Israel.

“Everything here was designed for the next generation of researchers” – Prof. Tal Dvir, Director of the Jan Koum Center for Nanoscience and Nanotechnology.

The entrance lobby of the Roman Abramovich Building for Nano and Quantum Science & Technology

“Everything here was designed for the next generation of researchers,” said Prof. Tal Dvir, Director of the Jan Koum Center for Nanoscience and Nanotechnology. The Center comprises 126 research teams in diverse fields and is promoting fruitful academia-industry ties through extensive, long-term collaborative projects with over 35 industrial partners from Israel and worldwide.

A Journey of Innovation and Architecture

The Abramovich Building marks a new era in nanotechnology. Its ground floor, housing Israel’s largest clean room, is where nanomaterials and cutting-edge nanotechnologies are crafted and characterized, symbolizing the fusion of form and function at the forefront of scientific advancement.

“We thought about the future when we designed this building” –  Prof. Tal Dvir.

The project showcases a 1650 square meter basement housing an advanced sub-fab facility meeting stringent vibration standards for its electron microscopes.

“The building is also tied to multidisciplinary research and tech innovation while intensifying industry collaboration and forming new connections between the scientific world and society at large, and helping to maintain hand in hand israel’s standing forefront of scientific and technological progress” – Prof. Ariel Porat

From left: Prof. Tal Dvir, TAU VP Amos Elad, President of The Koun Family Foundation Yana Kalika, and Prof. Porat unveiling the sign for the Koum Center (photo Israel Hadari).

Advancing Research and Collaboration

The building will house thirty scientists working on nanotechnology solutions across various disciplines, including engineering, exact sciences, life sciences, and medical sciences. Exciting projects at Tel Aviv University include Professor Dan Peer’s nanobots that target and destroy cancer cells in the bloodstream and Professor Yael Hanein’s devices that integrate with the retina to restore vision for the blind.

The scientists at the Koum Center and Abramovich building are creating pioneering devices and drugs that will directly improve our lives by leading to better health care, faster and safer communications systems, a cleaner environment, enhanced national security, smarter products and more efficient energy use.

The exterior of the Roman Abramovich Building for Nano and Quantum Science & Technology

Global Coral Crisis: Deadly Sea Urchin Disease Discovered

TAU Researchers Found the Cause of Sea Urchin Deaths in the Red Sea, Potentially Threatening Coral Reefs Worldwide.

 

Wake-Up Call: Global Warming and Deforestation Threaten Wildlife

A New TAU Study Shows that Global Warming and Deforestation Could Cause Mass Animal Extinctions.

A joint study by TAU and the University of Colorado (CU) states that the combination of global warming and extreme heat events, alongside the continued expansion of deforestation in the world, may be devastating for many species of animals, especially those that know how to climb trees. As part of the study, the researchers focused on lizards and showed that following the effects of climate change, they will seek refuge from the hot ground by spending a lot of time on trees. However, due to human-related activities, such as deforestation, urbanization and the expansion of agricultural lands at the expense of natural lands, the availability of trees in the areas where the lizards live will decrease, and this may lead to the collapse of many populations.

The research was conducted under the leadership of doctoral student Omer Zlotnick from the laboratory of Dr. Ofir Levy at the School of Zoology, the Wise Faculty of Life Sciences and the Steinhardt Museum of Natural History at TAU and in collaboration with Dr. Keith Musselman from CU. The study was published in the journal Nature Climate Change. 

Climate Crisis: Animals Seeking Comfort in Trees

The researchers explain that the climate crisis and global warming force animals to search for more comfortable places to stay to escape the extreme heat, just as we look for a shady area on a hot day. For climbing animals, trees can serve as a comfortable and pleasant refuge. One of the reasons for this is that the farther you get from the ground, the lower the air temperature gets, and the stronger the wind becomes. Therefore, on hot days, for example, animals can climb up trees to escape from the hot ground.

The importance of trees, then, is expected to increase as the climate warms. The problem is that in many places in the world, the density of trees is decreasing, mainly due to phenomena such as deforestation and the expansion of the use of trees for various purposes such as construction, etc. This phenomenon creates a situation where, on the one hand, due to climate change, animals will depend more on trees for their survival, while on the other hand, the destruction of habitats will lead to a decrease in the availability of trees.

Lizards’ Habitat Loss

Doctoral student Omer Zlotnik: “As part of the research, we wanted to examine how the combined effect of these two processes would be on animals. Specifically, we focused on lizards because they are very dependent on their environment to maintain a normal body temperature, and a lack of comfortable places to stay can affect them dramatically. In the study, we used a computer simulation to simulate where the lizard should be, in the sun, in the shade, or on the tree, every minute for 20 years, under the climate conditions that existed in the past and under those expected in the future. Using the simulation, we examined how populations of lizards would be affected by climate change when trees are available and how their situation would change following the felling of trees in their habitat”.

Left to right – Dr. Ofir Levy & Omer Zlotnick

The results showed that, in general terms, climate change is going to benefit many lizard populations. In most places, the expected warming will allow lizards to be active longer throughout the day and the year, as there will be fewer times when it is too cold to come out of their burrows. However, when climate change occurs at the same time as the felling of trees, the trend is likely to reverse, so that many lizard populations may collapse. In areas with a warm climate, climate change, even if no trees are cut down, is expected to harm lizard populations, and cutting down trees will make the situation even worse.

“What’s really interesting about lizards is that they just need to be able to move a short distance around the tree trunk to get to a very different climate and habitat environment”, said Keith Musselman, an assistant professor in the Department of Geography and CU Boulder’s Institute of Arctic and Alpine Research. 

Musselman: “These microhabitats are particularly important when we think about how we modify our natural environment and make conservation decisions”.

Dr. Ofir Levy concludes: “Our research focused on lizards, but it actually demonstrates a broader problem that is relevant to many species of animals. Our results demonstrate that trees are crucially important to the ability of animals to cope with climate change, and in many cases, their availability can be, for the animals, the difference between crawling and collapsing. Our research proves how important it is to preserve forested areas and trees in general, especially in light of the changing climate. As part of the research, we also provide more practical tools for decision-makers, such as the height or density of trees required in different areas. We hope that this research will be used to build more effective programs for the conservation and restoration of natural areas so that we can provide the animals with what they need to survive”.

Will Existing Drugs Stop Cancer’s Bone Spread?

Existing Meds May Prevent Bone Spread in Breast Cancer Patients

Researchers at TAU developed a new therapeutic strategy based on existing medications to inhibit bone metastasis in breast cancer patients. Using both an animal model and tissue samples from patients in Israel and the US, they demonstrated that a combination of drugs already available on the market can hinder bone metastasis and improve survival. Based on their findings, the researchers predict that in the future, the treatment can apply to human patients with breast cancer, as well as other types of cancer.

The groundbreaking study was led by Prof. Neta Erez and Dr. Lea Monteran at Prof. Erez’s Laboratory for Tumor Biology at the Pathology Department, Faculty of Medical and Health Sciences, Tel Aviv University. The paper was published in Cancer Discovery. The researchers explain that over 75% of patients with metastatic breast cancer suffer from bone metastases, which destroy bone tissues, causing fractures and a great deal of pain. Moreover, with today’s technologies such as MRI or CT imaging, diagnosis of bone metastasis occurs, in most cases, when the disease cannot be cured.  In this study, the researchers looked for a novel way to inhibit the progression of bone metastasis. 

Cancer Cell Sabotage

Prof. Erez: “A tumor is more than a collection of cancer cells. Just like healthy tissues, a tumor is a whole ecosystem consisting of reciprocal interactions between different cell types, including cells of the immune system, connective tissues, blood vessels, etc. Moreover, cancer cells often ‘corrupt’ normal cells, causing them to ‘collaborate’ with the tumor and support the growth of cancer cells. Blocking the communication channels between cancer cells and healthy cells at an early stage can hinder the growth of cancer cells in the bones. To achieve this, the early stages of the process must be investigated”. To understand processes of bone metastasis the researchers compared three types of bones from model mice:  healthy, early-stage metastasis, and advanced metastasis. They found that when bone metastasis begins, T cells from the immune system arrive on the scene and penetrate the metastases but are unable to destroy them. 

Prof. Neta Erez

Next, the researchers discovered that the killing activity of T cells is inhibited by another type of immune cells and identified the proteins responsible for this effect. To neutralize these inhibitory proteins and reactivate the T-cells, they created a novel therapeutic combination that has never been tried before a drug that counters the activity of the immune-inhibiting cells, along with an antibody that activates T cells. This combination was administered to model mice, and the results were encouraging: the bone metastases were reduced, and survival was significantly improved compared to untreated model mice. 

At the final stage of the study, the TAU research team collaborated with the Sheba and Ichilov (Tel Aviv) Medical Centers and the Baylor College of Medicine in Texas. They examined tissue samples from bone metastases taken from patients with breast cancer, as well as other types of cancer, and found that the immune cells inhibiting T cells express the same proteins as those found in the animal model. Prof. Erez: “Our findings suggest that the combined treatment – attacking the cells that inhibit T cells while activating the T cells – can be effective for treating bone metastasis resulting from breast cancer as well as other types of cancer. The great advantage of our strategy is that both drugs are already available on the market and consequently, the process of obtaining permits to use them against bone metastasis in humans can be relatively short. At the same time, clinical trials need to verify the effectiveness of the new therapeutic strategy”.

The study was funded by the Israel Cancer Research Fund (ICRF), the Israel Science Foundation (ISF), Worldwide Cancer Research (WWCR), and the U.S. Department of Defense (DoD).

How Do Lightning Storms Affect North Pole Sea Ice?

TAU Research Shows that Lightning Storms are Causing Sea Ice to Melt Faster at the North Pole

A new international study with the participation of researchers from Tel Aviv University found that alongside the general warming of the globe, lightning storms have been directly hastening the ongoing process of sea ice retreat covering the Arctic Ocean. According to the researchers: “Until recently, lightning as a phenomenon was extremely rare in the Arctic region of the North Pole, due to the intense cold. However, due to the warming of the Earth, lightning storms have become more common there in the summers, and these storms further increase the melting process of the ice sheets – in a feedback loop”.

Prof. Colin Price and MSc student Tair Plotnik from the Department of Geophysics at TAU’s Porter School of the Environment and Earth Sciences participated in the study, alongside Dr. Anirban Guha and Dr. Joydeb Saha from Tripura University in India. The article was published in the journal Atmospheric Research.

Arctic’s Cold Reality: Understanding Rapid Ice Loss

Prof. Price explains: “The Arctic region is defined as the region located north of the 66.5° latitude. In the heart of this region, around the North Pole, there is no land, and due to the extreme cold conditions, the sea is covered with a thick layer of sea ice, which currently extends over about 8 million square kilometers. The white ice reflects the sun’s rays and thus contributes to the cooling of the Earth. But in recent decades, with the warming of the Earth, the ice cover has retreated at a rate of about 70,000 square kilometers per year, or 6.5% per decade (In this context, it is important to note that the temperature at the North Pole has been rising at an accelerating pace – about 4° until today, in contrast to about 1° on Earth as a whole).

Prof. Colin Price

The retreat of the ice increases the warming even further, because the dark areas of the ocean under the ice, which are getting bigger and bigger, absorb the sun’s rays that would normally be reflected in space. This is how a feedback loop is created: the retreat of the ice increases the warming, which in turn increases the melting of the ice, and the cycle repeats”.

Lightning’s Role in Polar Ice Melt

According to the researchers, the phenomenon of melting ice sheets at both poles is firstly attributed to the result of human activity due to the increase in the amount of greenhouse gases in the atmosphere, creating a kind of ‘blanket’ that preserves the heat and does not allow it to disperse into space. However, studies have not found a direct match between the greenhouse gas changes, which increase at a more or less constant rate every year, and the rate of sea ice melting, which varies immensely from year to year. This study sought to examine the possible effect of another factor – lightning storms – on the melting of the sea ice in the Arctic region.

The researchers explain that lightning, as a phenomenon, was extremely rare in the Arctic region until recently, due to the intense cold that prevails there. But in recent decades, apparently, due to global warming, lightning storms have been observed there in the summertime, when the sun does not set at all, heating the surface (Lightning storms form when the surface of the ground heats up, and pockets of air rise in the atmosphere, where they cool, condense, and become clouds that sometimes develop into thunderstorms).

To test their hypothesis that lightning storms contribute to the melting of the ice around the North Pole, the researchers compared two sets of data: images from NASA satellites that have been documenting the retreat of the ice in the Arctic Sea for more than 40 years, and lightning data collected by the global network WWLLN (wwlln.net) – which includes around 70 lightning detection stations, deployed in research institutions all over the world – one of which stands on the roof of the Faculty of Exact Sciences building at TAU. Prof. Price explains: “Lightning is the result of a massive electric field that is discharged at once and transmits radio waves that can be received even thousands of kilometers away from the lightning. The global network’s sensors detect and map thunderstorms anywhere on the planet, in real-time and non-stop. Cross-referencing the information from the various stations allows for an accurate determination of the location and time of each lightning strike detected, and thus, a global map of lightning over time is obtained. For this study, we collected data on lightning in the Arctic region during the summer months of June, July and August every year since 2010″.

Lightning Storms: Catalysts for Polar Ice Melt

A statistical analysis of the ice sheet retreat crossed with the number of lightning storms revealed a correlation: as the number of storms increased in a certain year, so did the melting of the sea ice increase that year. The researchers explain this by comparing thunderstorms to a giant vacuum cleaner, sucking water vapor up from the surface layer to the upper atmosphere (5-10km altitude), where it accumulates and acts like an additional blanket, trapping the surface heat from leaving, and increasing the surface temperature – just like man-made greenhouse gases. Another possibility observed in a previous study is that these same lightning storms lead to an increase in the formation of high cirrus clouds in the upper layers of the atmosphere – which also form a similar ‘blanket’.

Prof. Price concludes: “In our research, we found a clear statistical relationship between the number of lightning storms in the Arctic region in a certain year and the rate of sea ice melting that year. This means that the storms are another factor that increases the melting of the polar ice, producing a feedback loop: the initial melting of the ice increases the dark surface areas of the sea, which absorb more of the sun’s rays, warming up the waters, causing more melting, accelerating the rate of warming, which in turn increases the number of lightning storms, and the cycle repeats itself. As a result of this, and of the warming of the Earth in general, we expect that the frequency of lightning storms in the Arctic region will increase in the coming years, and with it, the rate of sea ice retreat in the Arctic Sea will accelerate”.

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