The Mission that Redefined our View of Earth (1964-1968) | Full Film | American Experience | PBS

Right now, deep under your feet, a ball of solid iron the size of the Moon is slowing down. Above you, the magnetic north pole is running toward Siberia faster than it has in centuries. And the day you just lived through was shorter than any day in recorded history. Something is happening to our planet, and the scientists watching it cannot fully explain why. Together we will chase a weak spot in Earth's shield nearly half the size of Europe, a core that has started spinning backward, and an ocean current that could stall and chill part of the world. If mysteries like this pull you in, take a second to like and subscribe, so you never miss where we go next. Every clue points to one dangerous question. Hold on tight. We begin.

Right now, three thousand miles under your feet, an iron ball the size of the moon has stopped spinning the way it used to. It slowed down. Then it reversed. And scientists only just proved it. That is not the only thing going wrong down there. A weak patch in Earth's magnetic shield has grown to nearly half the size of Europe, and it is getting worse every year. Satellites flying through it are already taking radiation hits. Meanwhile, up on the surface, our planet keeps breaking speed records, spinning faster than any point since we started measuring, then mysteriously slowing again, throwing off every atomic clock on Earth. We are going to travel into the molten heart of our planet, chase a magnetic pole racing toward Siberia, and stand inside the wobble that vanished for five years and came back flipped upside down.

In the vast dark, a planet spinning through space for billions of years is doing something it has never done before, at least never all at once. Earth's rotation is speeding up, then slowing down, in ways scientists did not predict. A hole in our planet's magnetic shield has grown to half the size of Europe. An ocean current that keeps an entire hemisphere from freezing has been weakening for twenty years straight. The ground is opening up in cities that never worried about it. Volcanoes buried under Antarctic ice may be waking. And the sun, at the peak of its own violent cycle, might be nudging fault lines that were already close to breaking. If you enjoy uncovering what is really happening to our planet, hit like and subscribe before we go further. Every fact ahead is real, checked, and stranger than fiction. Get ready. Earth is changing right in front of us. Sources: ESA on the South Atlantic Anomaly, University of Miami on the Atlantic conveyor slowdown, CNN on Atlantic circulation collapse risk, ZME Science on the 2026

Right now, thousands of miles beneath your feet, a ball of iron the size of the moon just reversed direction. Scientists confirmed it. You felt absolutely nothing. That is the strange part. The most dramatic events on this planet are happening in total silence, in places no human has ever seen, and in most cases, no human ever will. We think we know Earth. We have mapped every coastline, named every ocean, planted flags on every continent. But under our feet, the core is shifting shape. Above our heads, the planet's magnetic shield is tearing open. Sources

For 11,000 years, sheep have sustained human civilization, but their role is rapidly changing in the modern world. Across the globe, traditional shepherding is clashing with high-tech agriculture and environmental shifts. From remote Ethiopian highlands where prized breeding rams change lives, to elite Cambridge laboratories revealing surprising cognitive abilities, these resilient animals continue to defy expectations. Journey from the rugged mountains of North Macedonia during massive seasonal migrations to China’s massive industrial facilities processing a million animals annually. Discover how dedicated young shepherds in Scotland preserve ancient herding traditions with specialized border collies while utilizing remarkable genetic adaptations to protect their herds. Experience the unexpected survival tactics of unique breeds thriving on rocky islands and isolated pastures, proving why this ancient partnership remains vital to human survival.

For eleven thousand years, an unassuming animal has quietly shaped human civilization, helping empires rise and driving global economies. Long before modern money existed, these resilient ruminants served as a universal currency more practical than gold, providing food, milk, leather, and warm clothing to communities across the globe. Royal wool profits even funded historical voyages that altered map lines forever. Journey across remote mountain passes, ancient island traditions, and historic trading posts to see how a simple working animal rescued economies, cleared landscapes, and sustained human life through the ages. From intense long-distance migrations guarded against wild predators to traditional artisanal crafts passed down through generations, this story reveals why our modern world would look completely different without its most faithful companion.