Explain It Like I’m 5

Is space really just “nothing”… or is that vast blackness between the stars secretly full of stuff ? In this episode of Explain It Like I’m 5, Alex tackles the mind-bending question: what is space made of, and is it just a giant nothing-something? We explore why humans struggle to imagine “nothing,” how early philosophers argued about vacuums, and how modern physics flipped the script by showing t...

Why do we sort music into genres like rock, jazz, pop, rap, country, classical, K-pop, and EDM—and who decided that rock isn’t jazz? In this episode of Explain It Like I’m 5, Alex turns up the volume on the history and purpose of music genres. We explore why humans love labels and categories, how genres help us organize sound, and how they become part of our identity and community—from “I’m into p...

Why do humans love holidays so much—and who decided that these specific days get fireworks, feasts, and days off? In this episode of Explain It Like I’m 5, Alex unwraps the history and meaning of holidays and celebrations across cultures and time. We explore what a holiday actually is—a day set apart from ordinary life—and how the word began as “holy day” before expanding to include everything fro...

What is art, exactly—and why do some famous paintings look like random squiggles? In this episode of Explain It Like I’m 5, Alex dives into the big, colorful question of what counts as art and why humans have been making it for tens of thousands of years. From cave paintings and hand stencils to Renaissance masterpieces, modern abstract art, graffiti, and TikTok dances, we explore how art has alwa...

How did humans go from small bands of wandering hunter-gatherers to massive, noisy cities with skyscrapers, traffic, and corner coffee shops? In this episode of Explain It Like I’m 5, Alex explores how cities began and whether they really were just a “sleepover that never ended.” We break down what counts as a city—not just lots of houses, but permanent buildings, large populations, job specializa...

Why do humans have hair almost everywhere… except our palms, soles, and mysteriously bare elbows? In this episode of Explain It Like I’m 5, Alex unpacks the weird and wonderful world of human hair—what it is, why we still have it, and why it grows in some places and not others. We explore how each strand of hair grows from a hair follicle, how keratinforms the dead hair shaft we see, and why human...

What is memory, really—and why can you remember your first day of school but not where you left your shoes 10 minutes ago? In this episode of Explain It Like I’m 5, Alex unpacks the science and psychology of memory, explaining how your brain encodes, stores, and retrieves information. Instead of a perfect mental filing cabinet, memory is a constantly changing system that recreates your experiences...

Why do people keep secrets—and can a secret actually feel heavy ? In this episode of Explain It Like I’m 5, Alex explores the psychology and science of secrets, from little white lies and surprise parties to life-changing revelations and dangerous cover-ups. We break down what a secret really is (information you deliberately hide), why humans are wired to keep and share secrets, and how secrets sh...

How do stars actually shine—and could one ever burn out like a lightbulb? In this episode of Explain It Like I’m 5, Alex breaks down the science of stars in fun, simple language. We explore what a star really is (a massive sphere of hot plasma), how gravity forms stars from huge clouds of gas and dust, and how nuclear fusion in the core powers them for billions of years. You’ll learn how hydrogen...

Why do we actually get hungry—and is that loud stomach growl just our belly yelling at us for snacks? In this episode of Explain It Like I’m 5, Alex breaks down the science of hunger in simple, funny, and totally relatable terms. We explore what hunger really is, how your brain, stomach, and hormones team up to tell you it’s time to eat, and why you sometimes crave chocolate, fries, or cookies ins...

The oceans are always moving—rising, falling, swirling, and crashing—but what’s really making all that happen? In this episode of Explain It Like I’m 5 , Alex explores how tides, currents, and waves work together to keep Earth’s waters in constant motion. You’ll learn how the moon’s gravity creates tides, how the Earth’s spin and temperature differences drive ocean currents, and how waves carry en...

Why do people argue so fiercely over religion, politics, or even pizza toppings? In this episode of Explain It Like I’m 5 , Alex breaks down why humans fight over beliefs—and why we sometimes take them so personally. You’ll learn what beliefs actually are, how they shape our identity, and why our brains treat challenges to beliefs like physical threats. We’ll explore how evolution, fear, and belon...

Math is everywhere—from counting change to launching rockets—but what is it really? In this episode of Explain It Like I’m 5 , Alex explores one of humanity’s biggest brain-bending mysteries: what math actually is, where it came from, and why it seems to rule everything around us. You’ll learn how math evolved from tally marks and goat-counting to calculus and algorithms, why it predicts the unive...

Blood is strange. It’s inside us all the time, yet the moment we see it on the outside, we panic. It’s dramatic, a little scary, and completely essential to staying alive. In this episode of Explain It Like I’m 5 , Alex dives into why we have blood, what it does, and why it freaks us out so much. You’ll learn how blood actually works—what’s in it, how it moves oxygen and nutrients around your body...

olcanoes are Earth’s ultimate drama queens—beautiful, terrifying, and totally unstoppable. But how do they actually work? And yes… are they basically the planet’s angry pimples? In this fiery episode of Explain It Like I’m 5 , host Alex dives deep (but not too deep!) into the molten world of volcanoes—how they form, why they erupt, and how they’ve shaped our planet. You’ll learn: What’s really hap...

Why does Earth have winter, summer, and everything in between—and does it just like spinning fancy while it orbits the sun?  In this episode of Explain It Like I’m 5 , host Alex unpacks the science (and silliness) behind seasons: why they exist, what causes them, and how they’ve shaped life, culture, and even our holidays. You’ll learn: Why Earth’s tilt, not its distance from the sun, creates seas...

Fire is terrifying—and yet, it’s the reason we’re here. From lightning strikes and volcanoes to campfires and stovetops, how did humans first discover fire? And who was the first brave (or foolish) soul to actually touch it? In this episode of Explain It Like I’m 5 , host Alex dives into the wild story of how fire began, how early humans learned to control it, and how it completely reshaped our sp...

Pain: everyone hates it, but none of us can live without it. From paper cuts to heartbreak, why does our body insist on sending us those “ouch” signals—and could we ever just switch them off like Wi-Fi? In this episode of Explain It Like I’m 5 , host Alex unpacks the weird science of pain: how it works, why it exists, and what would happen if we didn’t feel it at all. You’ll learn: How pain acts l...

Plants have a secret superpower: they eat sunlight. Meanwhile, we humans can barely make toast without burning it. In this bright and leafy episode of Explain It Like I’m 5 , host Alex breaks down the magic of photosynthesis—how plants turn light into lunch—and why we can’t do the same no matter how much sunbathing we try. You’ll learn: What photosynthesis actually is (and the simple equation behi...

Why do we have countries at all? Couldn’t Earth just be one big global clubhouse? 🌍 In this episode of Explain It Like I’m 5 , host Alex unpacks one of humanity’s biggest—and strangest—ideas: borders. From ancient tribes and empires to the Treaty of Westphalia and modern nation-states, we’ll explore how humans went from “our cave vs. your cave” to nearly 200 separate countries—each with its own f...

How do computers “think”—and do they secretly gossip about us when we’re not looking? In this episode of Explain It Like I’m 5 , Alex breaks down the hidden world of binary code, transistors, and logic gates, showing how machines turn 1s and 0s into everything from cat videos to space missions. We’ll explore the difference between processing and understanding, the rise of AI, and why your devices...

Why do we laugh? And what’s really going on when someone tickles us into hysterics? In this episode of Explain It Like I’m 5 , Alex explores the science and psychology of laughter: from ancient theories (superiority, relief, incongruity) to modern research showing laughter as a powerful social glue. You’ll learn why humans and even rats laugh, why we can’t tickle ourselves, and how laughter boosts...

Why is the sky blue? And why do sunsets look like nature’s daily art show? In this episode of Explain It Like I’m 5 , Alex unpacks the physics of light and the atmosphere. From Rayleigh scattering (the reason blue dominates the sky) to why violet doesn’t win, and how sunsets filter into fiery reds and oranges, you’ll get the simple science behind one of Earth’s most beautiful mysteries. Plus, fun...

How did money begin? And did people really swap goats for shoes? In this episode of Explain It Like I’m 5 , Alex traces the quirky, creative, and sometimes downright strange history of money. From barter systems and cacao beans to cowrie shells, giant stone discs, gold coins, and paper bills, we’ll explore how humans went from trading goats to trusting paper, digital numbers, and even cryptocurren...