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Kurzgesagt - In a Nutshell - Season 13

Episode List

Alien Whales On Planet Nimbus - What Aliens Might Look Like
E1 - Alien Whales On Planet Nimbus - What Aliens Might Look Like

Aired: February 04, 2025

Humans assume aliens look human. But why would they? Let's explore what life might actually look like in strange, distant worlds.

This Is NOT An Anti Meat Video
E2 - This Is NOT An Anti Meat Video

Aired: February 25, 2025

Most of us love animals but also eat meat. Unfortunately, most animals we eat live in truly horrible conditions. We don’t torture them for better meat, just for cheaper meat. If we all paid just a bit more, we could avoid most animal suffering – often just for a few cents per meal. What would it truly cost us to avoid animal torture and still eat meat?

Why Your Brain Blinds You For 2 Hours Every Day
E3 - Why Your Brain Blinds You For 2 Hours Every Day

Aired: March 18, 2025

Reality is not real. Your world is a prediction. Every sight, sound, and touch you experience is the result of calculations your brain makes before reality even reaches you. It fills in gaps, fabricates details, and even alters time itself so you feel like you’re in control. But if everything you know is an illusion… what does that say about you? What does it mean for your choices? Is there even free will?

SOUTH KOREA IS OVER
E4 - SOUTH KOREA IS OVER

Aired: April 02, 2025

South Korea is heading toward a demographic collapse unlike anything the world has seen before. With the lowest fertility rate ever recorded and a rapidly aging population, the country faces a future of economic decline, shrinking cities, cultural erosion, and a vanishing workforce. By 2060, nearly half of South Koreans could be over the age of 65, and entire regions may be abandoned as the population continues to shrink. How did South Korea reach this point? Why might it no longer be possible to reverse the trend? And what does this mean for other countries on a similar path?

Your Time Machine Broke - At The Worst Time In History
E5 - Your Time Machine Broke - At The Worst Time In History

Aired: April 22, 2025

What happens when your time machine breaks and you end up stranded millions of years ago? You’ve landed in a world that’s nothing like today, facing deadly storms and unbearable heat, breathing toxic air. How can you survive long enough to make it back home?

We Finally Answered the MOST Important Question
E6 - We Finally Answered the MOST Important Question

Aired: May 06, 2025

Can jellyfish power Tokyo? What would happen if it rained bananas for a day? We're taking two of your most absurd (and brilliant) questions and answer them with real science.

Why Does Fentanyl Feel So Good?
E7 - Why Does Fentanyl Feel So Good?

Aired: May 20, 2025

Fentanyl is the deadliest illegal drug in US history by far. It’s often described as the ultimate high, but it’s actually an inferior, short-lived, and brutally addictive version of heroin. In this video, we explore what opioids do to your brain and body, what it feels like to take them, and why so many people are dying from Fentanyl overdoses without ever choosing to take it.

Why Is The US Dropping Billions Of Mutant Flies From The Sky?
E8 - Why Is The US Dropping Billions Of Mutant Flies From The Sky?

Aired: June 03, 2025

A war has been raging for decades in the jungles of Panama, as we fight one of the most terrifying parasites on Earth. It is so relentless that our best defense is to drop 100 million radiation-blasted, flesh-eating flies from the sky – every week. It’s one of the most successful biological campaigns in history, but it’s a war we can never stop fighting… and one we can’t afford to lose.

The Betrayal of Autoimmune Diseases
E9 - The Betrayal of Autoimmune Diseases

Aired: July 01, 2025

What happens when the immune system meant to protect you becomes your worst enemy? This is the betrayal of autoimmune diseases like Type 1 diabetes, multiple sclerosis, celiac disease, lupus, Crohn’s disease, and many others. What exactly goes on in your body and why does it happen in the first place?

Let's Kill You a Billion Times to Make You Immortal
E10 - Let's Kill You a Billion Times to Make You Immortal

Aired: July 29, 2025

No matter how likely your death is, there will always be a version of you that survives. At least according to one of the most bizarre interpretations of quantum mechanics, known as Quantum Immortality. Can science prove that you are unkillable? And does this mean our reality is split into an endless number of copies?

Alcohol is AMAZING
E11 - Alcohol is AMAZING

Aired: August 12, 2025

Alcohol kills more people each year than wars, terrorism, homicides, and car accidents combined. It destroys bodies, relationships, and lives. Yet we toast with it at weddings, sip it at parties, and unwind with it after work. Why do we cling to something so harmful?

The Drug That Works TOO Well?
E12 - The Drug That Works TOO Well?

Aired: August 19, 2025

From study sessions to dance floors, amphetamines can feel like a shortcut to superhuman focus and energy. Why do they work so well? What happens to your body once you take them? And what toll does it take on your health?