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  • Jonathan Leaf on What New Research about Men and Apes Says about Human Nature
    Every schoolboy has been told that, to understand human nature, we must look to our closest genetic relatives—the chimpanzees. Jane Goodall's pioneering research revealed that chimps use tools, hunt cooperatively, and engage in violent activity that looks like warfare. And from these observations, she and generations of scientists who followed in her wake have concluded that humans are essentially advanced primates, and that our behaviors—from violence to sexuality—flow from this genetic inheritance.   But what if this foundational assumption is wrong?   The Primate Myth: Why the Latest Science Leads Us to a New Theory of Human Nature is a new book by the playwright and critic Jonathan Leaf. Based on vast quantities of scientific literature, Leaf argues that recent genetic and neuroscientific discoveries are overturning decades of conventional wisdom. A landmark study published in April 2025 revealed that humans share only 86.5 percent of our genes with chimpanzees—not the 98.6 percent we've long believed. More importantly, the differences are concentrated precisely where they matter most: in the structures of our brains that govern cooperation, empathy, and language.   Leaf's thesis is both scientific and moral. If humans are not primarily aggressive primates but rather cooperative pack animals—closer in crucial ways to dolphins and wolves than to chimps—then it's high time to reconsider the natural impulses that lie at the roots of war, family, and human flourishing.   Leaf joins Mosaic's editor Jonathan Silver to discuss his book and its implications.
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  • Samuel Kassow on the Warsaw Ghetto Uprising
    Last week, Michael Smuss died at age ninety-nine. Born in 1926, he was the last surviving fighter of the Warsaw Ghetto Uprising. His passing marks the end of an era, and brings to a close a chapter of living memory. Now the responsibility to tell this story passes fully to us. In the spring of 1943, against impossible odds and with almost no weapons, a small group of young Jews in Nazi-occupied Warsaw staged a revolt that would reverberate through history. This was not just a military engagement, but a story of Jewish resistance, dignity, and moral choice under unimaginable circumstances. Before the war, Warsaw was home to nearly 400,000 Jews—the largest Jewish community in Europe. This was a vibrant, diverse Jewish population: workers and intellectuals, religious and secular, Yiddish-speakers and Polish-speakers. Jews published daily newspapers, ran theaters, fielded soccer teams. They were 40 percent of Warsaw's population. Then came September 1939. Within weeks, Warsaw fell to the Germans. Over the next year, the Nazis systematically stripped Jews of their rights—blocked bank accounts, forced them to wear special armbands, and conscripted them into slave labor. In November 1940, they sealed 400,000 Jews into a ghetto of just two square miles, then forced in 150,000 more from nearby towns and cities. With official rations of just 184 calories per day and no heating, 100,000 Jews died of starvation and disease. But 80 percent stayed alive through extraordinary resourcefulness—smuggling food, establishing soup kitchens, creating underground factories. This too was resistance. In July 1942, the Germans began mass deportations to Treblinka, where most were murdered upon arrival. Over seven weeks, they sent 300,000 Jews to the gas chambers, with the help of a Jewish police force. By September, only 60,000 remained. At that point, something shifted. Survivors asked why they hadn't fought back. The shame and anger became a catalyst. Between September and April, the ghetto prepared. They built 750 bunkers with electricity, water, and food stocks. When the Germans came on April 19, 1943, expecting to round up the Jews with no resistance, they were met with gunfire, grenades, and mines. The Germans thought it would take three days. It took 27—because the entire community had transformed the ghetto into a network of underground revolt. To tell this story, Mosaic's editor Jonathan Silver is joined by Professor Samuel Kassow of Trinity College. They discuss the courage of the fighters as well as the resistance of those who built the bunkers, who preserved cultural life, who maintained their dignity in ways that have largely been forgotten. They also confront difficult questions about heroism, survival, and how to fulfill the sacred obligations of remembering.
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  • John Spencer on the Fate of Gaza's Tunnels
    Now that there is a fragile cease-fire in place, it's time to ask what to do with Gaza's intricate system of tunnels. There is, of course, nothing new about the use of tunnels in war. From ancient Jerusalem to Vietnam to Islamic State in Mosul, militaries have dealt with underground warfare for millennia. But the scale, purpose, and strategic role of Hamas's tunnel network is fundamentally different from anything we've seen before. Gaza is approximately 140 square miles, and there are at least 600 miles of tunnels below its terrain. Before the war began, there were likely more tunnels in Gaza than there were roads. But it's not just the density of Gaza's tunnels that is unprecedented. For the first time in history, a military force built its entire strategy around its subterranean defenses, deliberately constructing tunnels beneath civilian infrastructure—schools, hospitals, homes—not to protect civilians, but to use them as human shields. This wasn't merely a tactical decision; it was the primary means by which Hamas intended to achieve its political goals. John Spencer, a leading expert on urban warfare and military history and executive director of the Urban Warfare Institute, joins the Tikvah Podcast to discuss this unprecedented military challenge. He has visited Gaza six times since October 7, studying these tunnels firsthand and speaking with the Israeli commanders who've had to fight in them. Today, he walks us through how Israeli forces had to remap the battlefield and reimagine warfare, learning to fight simultaneously above and below ground. We'll discuss the psychological demands of entering these tunnels, the innovative tactics that turned Hamas's greatest defensive asset into an Israeli offensive advantage, and the immense challenge that remains: what do you do with hundreds of miles of tunnels now that active hostilities have paused?
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  • Tomer Persico on the Image of God: How Genesis gave rise to modern secularism
    "God created man in His image: in the image of God He created him; male and female He created them." Thus reads verse 27 of the first chapter of Genesis, one of the most important lines ever written in history. The Hebrew phrase rendered as "in God's image" is b'tselem Elohim, and that is the title of a new book that traces the extraordinary career of this concept, known in Latin as imago Dei, throughout the course of Western civilization. Written by Tomer Persico, a research fellow at the Shalom Hartman Institute, the book is the biography of the idea that all human beings—not just kings or heroes—are created in the image and likeness of God. At the heart of the book is a deep irony: the religious idea of imago Dei contains within it the seeds of secularization; this religious innovation developed into a concept that would marginalize religion itself. The very emphasis on individual conscience and human equality that Judaism and Christianity cultivated eventually led to further questioning of law, and then authority, and then even the disciplines of religious life. That is, over the course of millennia, one of God's pronouncements led some to question God's providence and even God's existence. Now, if you're listening as an orthodox believer or theological traditionalist, you may be tempted to object: surely modern secularism represents a betrayal of the biblical depiction of the human condition, not an outgrowth of it, and there is much truth to that position. But Persico's argument is directed primarily at the committed liberal democrat who believes deeply in individual rights, human dignity, and equality, but who may not realize where these convictions come from. To that person, Persico seems to be arguing: even you, especially you, are an inheritor of a biblical idea. Your deepest moral commitments didn't spring from nowhere. They have a genealogy that begins in Genesis. On today's podcast Mosaic's editor Jonathan Silver sits down with Persico to discuss what all this implies.  
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  • Yaakov Katz on Israel's New Laser Defenses
    On September 17, 2025, Israel announced that the world's first laser defense system was ready for deployment, and was being integrated into its multitiered missile-defense shield. Iron Beam may be the most significant advance in missile defense since Israel pioneered the concept of intercepting missiles with missiles back in the 1980s. That's because Iron Beam promises to solve one of modern warfare's most vexing problems: the economic asymmetry of defense. When a crude, unguided rocket costing a few thousand dollars must be stopped with an interceptor costing between $50,000 and $100,000, the math quickly becomes unsustainable. The scale of rocket, drone, and missile fire into Israel over the last two years, coupled with the yet-unlaunched arsenals that Iran and her proxies have in reserve, would, if each one needed to be defended by traditional interceptors, cripple Israel's economy. But Iron Beam changes that calculus entirely. Rather than the $40,000–$50,000 interceptor, each laser interception costs roughly two dollars—the price of the electricity that powers it. The system has what military officials call an "endless magazine," capable of firing continuously as long as it has power. It's already battle-tested, shooting down over 40 drones from Lebanon during recent conflicts. But this breakthrough also raises profound questions. Israel's intelligence failures on October 7, 2025 partly stemmed from an overreliance on technological solutions—the belief that smart fences and surveillance systems could replace human judgment and offensive action. As Israel celebrates this remarkable achievement of military innovation, how do we ensure Iron Beam enhances rather than replaces sound strategic thinking? To discuss these questions, Mosaic's editor Jonathan Silver is joined by Yaakov Katz, former editor of the Jerusalem Post and author of the new book While Israel Slept. Together, they explore what Iron Beam means for Israel's defense, for military cooperation between Israel and America, and the future of warfare.
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Über The Tikvah Podcast

The Tikvah Fund is a philanthropic foundation and ideas institution committed to supporting the intellectual, religious, and political leaders of the Jewish people and the Jewish State. Tikvah runs and invests in a wide range of initiatives in Israel, the United States, and around the world, including educational programs, publications, and fellowships. Our animating mission and guiding spirit is to advance Jewish excellence and Jewish flourishing in the modern age. Tikvah is politically Zionist, economically free-market oriented, culturally traditional, and theologically open-minded. Yet in all issues and subjects, we welcome vigorous debate and big arguments. Our institutes, programs, and publications all reflect this spirit of bringing forward the serious alternatives for what the Jewish future should look like, and bringing Jewish thinking and leaders into conversation with Western political, moral, and economic thought.
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