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What If: Science, Theory, and Possibilities

by What If
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Latest episodes

  • What Happens If You Dive Into the Mariana Trench?

    October 23, 2026 · 4 min

    What would happen if you dove into the Mariana Trench? Explore the intense conditions of the deep ocean and discover rare footage from Earth's deepest point. Reaching the Mariana Trench is harder than landing on the Moon. Fewer people have…

  • What If Earth Changed Completely? Ice Melt, Volcanoes and a Second Moon

    October 22, 2026 · 2 hr 11 min

    What would happen if Antarctica’s ice suddenly melted, the oceans drained, or Yellowstone erupted tomorrow? Explore hypothetical Earth transformations, from a water-covered planet to a world without humans. Discover how long traces of…

  • Mariana Trench: How Deep Is Earth’s Deepest Ocean Trench?

    October 21, 2026 · 4 min

    How deep does the ocean go? Explore the Mariana Trench, home to Earth’s deepest known point, and discover how its depths compare with Mount Everest. If Mount Everest were placed in the Mariana Trench, more than 2 km of water would still…

  • What If We Moved Everyone To Mars?

    October 20, 2026 · 29 min

    War, environmental destruction, global warming, species extinction... Spaceship Earth is being trashed by its crew. It seems humanity needs a Plan B. Fast. And the obvious candidate? Mars is staring down at us every night. Mars has a total…

  • What If Prehistoric Monsters Never Went Extinct?

    October 19, 2026 · 1 hr 11 min

    Enjoying this video? Dive even deeper into the world of science and discovery with Popular Science, the free streaming channel bringing you more of what you love from What If, plus epic explorations in engineering, rocket launches, movies…

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  • How is Earth Perfectly Suited for Life?

    October 16, 2026 · 23 min

    You are the end result of a series of coincidences so specific and numerous that it boggles the mind. Some scientists even find it unsettling. Have you ever wondered: why me? Why this planet? Why is Earth so perfectly suited for life? Join…

  • Humanity as the Most Powerful Civilization in the Universe

    October 15, 2026 · 3 hr 16 min

    Enjoying this video? Dive even deeper into the world of science and discovery with Popular Science, the free streaming channel bringing you more of what you love from What If, plus epic explorations in engineering, rocket launches, movies…

  • What If the Universe Starts Shrinking?

    October 14, 2026 · 24 min

    This isn't the first time you've pondered this question. Imagine the Universe not expanding but shrinking, with spacetime contracting until it forms a singularity smaller than a YouTube Like button. After collapsing, there's a possibility…

  • The Insane Scale of the Ocean Explained

    October 13, 2026 · 27 min

    Our planet is hiding something remarkable from you. The ocean is vast, and if you dropped Mount Everest into the Mariana Trench, there'd still be over 2 km of water above its peak. Imagine if the ocean were devoid of water and you leapt…

  • Everything That Ever Happened to Planet Earth

    October 12, 2026 · 1 hr 46 min

    Enjoying this video? Dive even deeper into the world of science and discovery with Popular Science, the free streaming channel bringing you more of what you love from What If, plus epic explorations in engineering, rocket launches, movies…

  • Mining Every Planet in the Solar System

    October 9, 2026 · 28 min

    Your data is being mined right now. Protect yourself with Proton VPN. Encrypt your online presence, unlock geo-blocked content, and browse privately. Get up to 70% off: Proton VPN Every planet has something to hide, buried treasure worth…

  • Every Alien World We Could Actually Live On

    October 8, 2026 · 1 hr 23 min

    Enjoying this episode? Dive deeper into the world of science and discovery with Popular Science, the free streaming channel bringing you more of what you love from What If, plus epic explorations in engineering, rocket launches, movies…

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About the show

An epic exploration of possibilities. What If is a Webby Award-winning science web series that takes you on a journey through hypothetical worlds and possibilities, some in distant corners of the universe, others right here on Earth. Each scenario examines a scientific theory, research or fact through a hypothetical question.