Kurzgesagt Podcast: Science Revealed

Have you ever stepped out of the shower and noticed your fingertips looking shriveled and wrinkled?
It may seem like a simple reaction to water, but the real explanation is far more surprising. Scientists have discovered that wrinkled fingers aren’t just the result of your skin soaking up water—they’re actually controlled by your nervous system.
Why do only your fingers and toes wrinkle? What purpose do these wrinkles serve? And could they be an evolutionary adaptation that helped our ancestors survive?
In this episode, we dive into the fascinating science behind one of the most c...

It’s the kind of disaster usually reserved for science fiction—but what if it actually happened?
In this episode, we explore the terrifying possibility of an asteroid striking near or directly into a major city. Using real-world science and historical impacts as our guide, we examine what determines whether a city survives or is devastated.
How powerful would the impact be? Could modern technology detect the asteroid in time? And what defenses does humanity have against a threat from space?
From shockwaves and firestorms to evacuation plans and planetary defense systems, we break down the physics, the...

It's a question most of us ask as children, yet the answer reveals some of the most fascinating principles of physics. Why does the sky appear blue during the day, turn brilliant shades of red and orange at sunset, and become black at night?In this episode, we unravel the science behind the colors of the sky. Discover how sunlight interacts with Earth's atmosphere, why blue light scatters more than other colors, and how a phenomenon known as Rayleigh scattering paints the world above us. We'll also explore the stunning science behind sunsets, the colors of distant planets' skies, and...

Everything around us from the air we breathe to the stars shining across the night sky is made of something. But when scientists looked deeper into the cosmos, they discovered a shocking mystery: the matter we can see accounts for only a tiny fraction of the universe.In this episode, we explore one of the biggest questions in science: What is the universe really made of? Journey from ordinary atoms and subatomic particles to the invisible realms of dark matter and dark energy. Discover why galaxies spin the way they do, how scientists detect things they cannot see, and why...

Most people think of Vaseline as just a simple moisturizer—but this everyday product has far more uses than many realize. 
In this episode, we uncover ten practical and surprising ways Vaseline can be used beyond skincare. From beauty routines and protecting dry skin to household hacks and everyday convenience, we explore how one small jar became a staple in millions of homes around the world.
Which uses actually work? What are the best ways to apply it? And which popular tricks are worth knowing?
Whether you already use Vaseline daily or keep it tucked away in a c...

Invisible to the naked eye, yet powerful enough to bring entire healthcare systems to the brink of collapse—the Ebola virus is one of the deadliest diseases ever discovered. 
In this episode, we explore the origins, spread, and impact of the Ebola virus, from its first recorded outbreaks in Central Africa to the global fear sparked by major epidemics. Known for its severe symptoms and high fatality rates, Ebola has challenged doctors, scientists, and governments for decades.
How does the virus spread? Why is it so dangerous? And how have modern medicine and emergency responses helped contain outbreaks?

That instinct to lick a small cut might not be random—your saliva contains natural healing proteins like histatin, EGF, and Trefoil Factor 3 that help skin cells repair faster.
Studies show these compounds can speed up wound closure and even support new blood vessel growth, which is important for healing. In lab tests, wounds exposed to saliva-related compounds closed faster than untreated ones.
Scientists are still exploring how powerful this natural “built-in repair system” really is.

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A single outbreak can become a global crisis faster than most people realize. 
In this episode, we explore what a pandemic actually is, how diseases spread across countries and continents, and why some outbreaks remain local while others change the course of history.
What turns an epidemic into a pandemic? How do viruses spread so rapidly in a connected world? And how do scientists, governments, and healthcare systems respond when millions of lives are at risk?
From historical outbreaks to modern global health challenges, we break down the science of pandemics, the social impact they leave behind, a...

Artificial intelligence is rapidly entering hospitals, clinics, and even our phones—but can chatbots truly help doctors and patients? 
In this episode, we explore how AI-powered systems like ChatGPT and other medical assistants are being used to answer health questions, summarize records, support diagnoses, and improve communication between healthcare providers and patients.
Can chatbots reduce the workload on doctors? How accurate are they when discussing medical information? And what are the risks of relying on AI in healthcare?
From virtual symptom checkers to the future of digital medicine, we examine the promise, the limitations, and the ethical que...

Your kidneys work nonstop filtering waste, balancing fluids, and helping keep your body functioning properly. But the foods you eat every day can either support them… or put them under extra stress. 
In this episode, we explore the science behind kidney-friendly nutrition and the foods that may help support healthy kidney function. From hydration and low-sodium choices to antioxidant-rich fruits and vegetables, we break down what actually matters when it comes to protecting these vital organs.
Which foods are easiest on the kidneys? What eating habits may help reduce strain over time? And which popular “detox” claims are more my...

Color television seems simple today… but getting there was anything but. 
In this episode, we explore the decades-long challenge of bringing color to the screen. Early engineers weren’t just trying to add color—they had to reinvent how images were captured, transmitted, and displayed, all while making sure new broadcasts still worked with millions of existing black-and-white TVs.
Why was color so difficult to achieve? How do you send color signals without breaking older systems? And what technological breakthroughs finally made it possible?
From competing standards to the science of light and human vision, we break down th...

In the early hours of April 26, 1986, a routine safety test turned into one of the worst nuclear disasters in human history. 
In this episode, we uncover the story of the Chernobyl disaster, which occurred at a reactor in Chernobyl Nuclear Power Plant in the former Soviet Union. A combination of design flaws and human error led to a catastrophic explosion, releasing radioactive material across vast parts of Europe.
What went wrong inside the reactor that night? Why did the situation spiral out of control? And how did authorities respond in the critical hours that followed?
From the e...

The Moon looks small in the sky… but its true size might surprise you.
In this episode, we take a closer look at Earth’s only natural satellite — the Moon — and explore just how big it really is. From its diameter and mass to how it compares with planets and other moons in the solar system, the numbers tell a much bigger story than what we see from Earth.
How does the Moon compare to Earth? Why does it appear larger than it actually is? And what would happen if it were any bigger… or smaller?
We break down...

The ocean covers most of our planet… but we’ve barely explored what lies beneath. 
In this episode, we take a journey from the surface all the way down to the deepest known point on Earth — the Mariana Trench. As we descend layer by layer, sunlight fades, pressure rises, and the environment becomes more extreme than almost anywhere else on the planet.
What lives in total darkness? How deep can humans actually go? And what secrets are still hidden miles below the surface?
From the twilight zone to the crushing depths of the abyss, we explore the science...

This episode explore the biological necessity and physiological mechanisms of sleep, emphasizing its role in maintaining metabolic, cognitive, and systemic health. Research on rats and fruit flies demonstrates that prolonged sleep deprivation leads to fatal outcomes, including oxidative stress in the gut, thermoregulatory failure, and impaired cerebral glucose metabolism. Key theories such as Synaptic Homeostasis (SHY) and the Brain Plasticity theorysuggest that sleep is essential for downscaling neural connections and reorganizing brain structure. Additionally, the discovery of the glymphatic system reveals that sleep facilitates the cleansing of neurotoxic waste via cerebrospinal fluid pulses. Recent evidence even suggests that mitochondria act...

It sounds strange… If you were standing on the Moon, surrounded by the darkness of space, you should see more stars than ever—right?
Not exactly.
In this episode, we uncover why astronauts on missions like Apollo 11 reported seeing almost no stars while standing on the lunar surface. The answer lies in a surprising combination of light, human vision, and camera exposure.
Why does the Sun’s glare overpower the stars? How does the Moon’s surface reflect light? And why do photos from space often appear starless?
From the science of brightness and contrast to how our...

Long after the last stars have burned out… the universe doesn’t end. It simply goes quiet. 
In this episode, we travel unimaginably far into the future — beyond galaxies, beyond light — into the era where only the remnants of dead stars remain. White dwarfs cool, neutron stars fade, and what’s left slowly transforms into cold, lifeless objects known as iron stars.
Guided by the principles of thermodynamics and the relentless march of entropy, we explore how matter itself evolves over trillions upon trillions of years. No more fusion. No more light. Just a dark universe drifting toward equilibrium...

The moment we create an intelligence greater than our own… everything changes.
In this episode, we explore what happens after the birth of Artificial General Intelligence — a system capable of understanding, learning, and reasoning beyond human limits. Not in decades… but the very next day.
Who controls it? Can it be contained? Or does control become an illusion the moment it surpasses us?
From global power shifts and economic disruption to ethical dilemmas and existential risks, we break down the immediate consequences of creating something that could outthink every human on Earth.
Will it solve humanity’s greate...

Stiff-person syndrome is a rare neurological disorder that affects the brain and nervous system, causing severe muscle stiffness and painful spasms.
In this episode, we break down what Stiff-person syndrome really is, why it happens, and how it impacts the people living with it. The condition is believed to be an autoimmune disorder, where the body’s immune system mistakenly attacks parts of the nervous system—especially those responsible for controlling muscle movement.
People with stiff-person syndrome often experience:
Progressive muscle stiffness, especially in the torso and limbsSudden, intense muscle spasms triggered by noise, touch, or emotional stre...

What if your thoughts… weren’t entirely your own? 
In this episode, we uncover the disturbing world of microscopic parasites that can hijack the brains and behavior of much larger, more complex animals. From fungi that control insects to parasites that alter fear, movement, and decision-making, these tiny organisms can turn living creatures into unwitting hosts — or even “puppets.”
At the center of it all is Toxoplasma gondii, a parasite known to influence the behavior of rodents — and possibly even humans.
How do these organisms take control of a host’s brain? Why would evolution favor such bizarre strateg...

the edge of space and time, the rules of the universe begin to break. 
In this episode, we dive into the extreme physics of black holes — where gravity becomes so powerful that not even light can escape. From the moment a star collapses into a singularity to the formation of an event horizon, we explore what really happens inside these cosmic giants.
How do black holes grow? What happens to anything that falls in? And could they eventually evaporate through Hawking radiation?
We’ll uncover the strange dynamics that govern black holes — from warped spacetime predicted by the The...

The universe was not always filled with shining galaxies and blazing stars. In fact, after the explosive birth of the cosmos during the Big Bang, there was a long and mysterious period when the universe was mostly dark.
Scientists call this era the Cosmic Twilight—a transitional age when the first faint lights of the universe began to appear. During this time, gravity slowly pulled clouds of hydrogen together, igniting the very first stars and galaxies. These early cosmic pioneers started to illuminate the darkness and reshape the universe forever.
In this episode, we explore the chronology of th...

Your brain time-travels every day.
It replays the past, predicts the future, and even invents memories that never happened. In this episode, we dive into the science of memory, imagination, and “mental time travel” — and reveal why your mind might be the most advanced time machine ever built.

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You’ve probably heard the warning before: “Don’t drink water right after eating—it ruins digestion.” But is that actually true… or just a myth? In this episode, we separate fact from fiction and explore what really happens inside your body when you drink water during or immediately after a meal. 
Does water dilute stomach acid? Slow digestion? Cause bloating or weight gain? Or does it actually help your body break down food more efficiently? We dive into the science of digestion, stomach enzymes, hydration, and nutrient absorption to explain how your body truly handles liquids with food.
Plus, we...

Het is het verschil tussen leven en dood, verpakt in een ritme van 100 tot 120 slagen per minuut. We hebben het allemaal wel eens gezien in films, maar wat gebeurt er nou écht in het menselijk lichaam tijdens reanimatie (CPR)?
In deze aflevering duiken we in de fascinerende wetenschap achter de borstcompressie. We laten de medische jargon achterwege en leggen uit hoe jij fungeert als een handmatige pomp voor het hart en de hersenen wanneer het systeem uitvalt. Van de cruciale rol van zuurstofrijk bloed tot de psychologie van het handelen in een crisissituatie: dit is alles wat je moet w...

Ginger isn’t just a kitchen spice—it’s one of the most powerful natural roots used in traditional medicine for centuries. But what makes it especially beneficial for men’s health? In this episode, we explore the science behind ginger and how its active compounds may support energy, circulation, testosterone levels, heart health, digestion, and immune function. 
We break down research on how ginger can help reduce inflammation, improve blood flow, support fertility, ease muscle soreness after workouts, and even aid metabolic health. You’ll also learn the safest and most effective ways to consume it—whether fresh, powdered, or...

What if one year could redefine the future of humanity? In this episode, we explore the most exciting and game-changing scientific breakthroughs of 2026—from advances in artificial intelligence and medicine to space exploration, clean energy, and quantum technology. These aren’t just lab experiments; they’re discoveries already shaping how we live, work, and survive on this planet. 
We break down cutting-edge innovations like next-generation vaccines, smarter AI systems, fusion energy progress, new exoplanet findings, and revolutionary materials that could transform transportation and computing. More importantly, we explain what these breakthroughs actually mean in everyday terms—who benefits, who’s at risk...

Launched in 1977, Voyager 1 has traveled farther than any human-made object in history—and what it discovered at the edge of our solar system reshaped our understanding of space. In this episode, we explore Voyager 1’s historic journey beyond the planets and into interstellar space, explaining what it actually detected as it crossed the heliopause—the boundary between the Sun’s influence and the wider galaxy.
We break down the strange changes in cosmic radiation, magnetic fields, and charged particles that confirmed Voyager 1 had truly left the solar system. You’ll also learn what the spacecraft revealed about the solar wind, how...

The Gulf Stream is one of the most powerful and influential ocean currents on Earth—and it quietly shapes weather, climate, and life across the planet. In this episode, we explore how the Gulf Stream forms, how it moves warm water across the Atlantic, and why it plays a crucial role in regulating temperatures in North America and Europe.
We break down the science behind ocean circulation, the connection between the Gulf Stream and global climate systems, and what could happen if this current weakens or shifts due to climate change. From milder European winters to stronger storms and ri...

Water is everywhere—but why do we actually need to drink it to survive? In this episode, we break down the science of hydration and explain the vital roles water plays in the human body. From regulating body temperature and transporting nutrients to supporting brain function and cellular chemistry, water is at the center of nearly every biological process. We’ll also explore what happens when you don’t drink enough, how hydration needs vary by age and activity, and common myths about water intake. A clear, science-backed look at why water isn’t just refreshing—it’s essential for life.
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Cannabis is often labeled as harmless—but is it really? In this episode, we take a science-based look at marijuana use and explore when, why, and how it can start doing more harm than good. From brain chemistry and motivation to mental health, sleep, memory, and long-term dependence, we break down what research actually says about frequent weed use. 
We discuss how cannabis affects dopamine, productivity, emotional regulation, and anxiety, why quitting can be harder than expected, and what withdrawal really feels like. This episode also examines who is most at risk, how tolerance quietly builds, and why “everyone’s doing...

What are the fundamental principles that govern the natural world? In this episode, we explore the core foundations of the natural sciences—physics, chemistry, biology, and earth science—and how they work together to explain reality. From observation and experimentation to scientific laws, theories, and models, we examine how knowledge is built, tested, and refined over time. The episode also highlights key concepts such as causality, energy, matter, evolution, and systems thinking, revealing how these ideas unify diverse scientific disciplines. Whether you’re a student, a curious learner, or a science enthusiast, this episode offers a clear and engaging roadmap to und...

Thyroid disorders affect millions of people worldwide, yet they often go undiagnosed or misunderstood. In this episode, we explore the science and clinical management of common thyroid conditions, including hypothyroidism, hyperthyroidism, Hashimoto’s disease, Graves’ disease, and thyroid nodules. We break down how the thyroid gland regulates metabolism, energy, growth, and hormone balance—and what happens when this system goes wrong.
You’ll learn to recognize key symptoms, understand diagnostic tools such as blood tests and imaging, and gain insight into modern treatment options ranging from medication and lifestyle management to surgery and radioactive iodine therapy. This episode provides a clear...

As 2025 comes to a close, this episode takes a sweeping look at the scientific breakthroughs, discoveries, and debates that shaped the year. From major advances in artificial intelligence and medical research to new insights in space exploration, climate science, and quantum technology, Scientific Horizons: The 2025 Year in Review breaks down what mattered most—and why. We explore how these developments are already influencing everyday life, the ethical questions they raise, and the discoveries that could redefine the future. Whether you’re a science enthusiast or just curious about where humanity is headed, this episode offers a clear, engaging snapshot of the...

What if the science behind Stranger Things isn’t as fictional as it seems? In this episode, we break down the real physics concepts hidden beneath the show’s supernatural storylines—from parallel universes and alternate dimensions to electromagnetism, energy fields, and the limits of human perception. How close is the Upside Down to real multiverse theories? Could portals, telekinesis, or time distortion ever exist according to modern physics? We separate cinematic fantasy from scientific fact, using real-world theories to explain what Stranger Things gets right, what it exaggerates, and what remains purely science fiction. Perfect for fans of the show a...

MRI machines are among the most powerful medical tools ever built—but they’re also incredibly dangerous if basic rules are ignored. In this episode, we break down why wearing metal in an MRI machine can be life-threatening. From the extreme magnetic forces that can turn everyday objects into deadly projectiles to the science behind radiofrequency heating and electrical currents inside the body, we explain what really happens when metal meets an MRI. You’ll hear real-world incidents, the physics behind the risks, and why even tiny metallic items—jewelry, implants, or forgotten coins—can cause serious injury or equipment damage. A...

Earth’s seasons are not caused by how close we are to the Sun, but by the planet’s axial tilt. In this episode, we explore how Earth’s 23.5-degree tilt affects the angle and intensity of sunlight received across different regions throughout the year, creating the cycle of spring, summer, autumn, and winter. 
You’ll learn how the tilt influences day length, solar energy distribution, and temperature changes, and why the Northern and Southern Hemispheres experience opposite seasons at the same time. We also clarify common misconceptions—such as why Earth is actually closest to the Sun during Northern He...

Bernoulli’s Principle explains the fundamental relationship between pressure, velocity, and height in a moving fluid. First formulated by Daniel Bernoulli in the 18th century, the principle shows that as the speed of a fluid increases, its pressure decreases—an idea that underpins much of modern fluid dynamics. 
In this episode, we break down the Bernoulli equation in simple terms, exploring how energy is conserved within flowing fluids and why pressure, kinetic energy, and potential energy are interconnected. You’ll learn how this principle applies to real-world phenomena such as airplane lift, wind over buildings, blood flow in arteries, carbure...

Isaac Newton’s Philosophiæ Naturalis Principia Mathematica is one of the most influential scientific works ever written, laying the foundations of classical physics. But what many people don’t know is that even Newton made a fascinating mistake inside this groundbreaking book—an error that went unnoticed for centuries.
In this episode, we uncover the surprising flaw hidden within the Principia, explore what Newton got wrong, and explain how modern scientists eventually discovered and corrected it. We also look at how this mistake reveals the challenges of early scientific discovery and why the Principia remains a masterpiece despite its imperfe...

What does a person experience when they’re in a coma? Are they dreaming, aware, or completely unconscious? In this episode, we break down the science of coma states—how they happen, what the brain is doing, and what patients report after waking up. From medically induced comas to traumatic brain injuries, we explore the biology of consciousness, recovery challenges, and the unexpected stories of those who came back.

You’ll learn:
🔬 What causes coma and how the brain behaves during it
🧠 The difference between a coma, vegetative state, and brain death
👁️ Whether coma patients can hear or feel...