In 1900, Galveston, Texas, was one of the richest and fastest-growing cities in America. On September 8, a hurricane slammed into the island with a storm surge more than 15 feet high, and by morning much of the city was gone. Between 6,000 and 12,000 people were killed, making it the deadliest natural disaster in U.S. history. In this episode of Knowledge Central, we look at how the storm caught a city by surprise, what that night was like, and how Galveston literally raised itself out of the sea afterward.

In this episode:

• Galveston in 1900: a booming port city on a low, flat barrier island
• The forecasts and warnings that failed to prepare the city
• The night of September 8: wind, storm surge, and a city underwater
• The aftermath, and the grim task of recovery
• The massive seawall, and how engineers raised the entire city’s ground level
• How the disaster changed hurricane forecasting, and shifted Texas’s future toward Houston

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Right now, nearly 2,000 thunderstorms are rumbling somewhere on Earth. They can build from a harmless puff of cloud into a towering giant in under an hour, packing lightning bolts hotter than the surface of the sun. In this episode of Knowledge Central, we look at how thunderstorms are born, what really makes thunder boom, and why some storms grow powerful enough to spin up tornadoes.

In this episode:

• How warm, moist air rising into the sky builds a storm cloud
• The life cycle of a thunderstorm, from growth to its mature stage
• What lightning is, and why it’s hotter than the surface of the sun
• Why thunder booms, and how to count the seconds to tell how far away a storm is
• Supercells, hail, and the storms that produce anti-matter

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Every year, the ground beneath our feet shakes hundreds of thousands of times. Most quakes are too small to feel, but a few are powerful enough to level cities and send tsunamis racing across oceans. In this episode of Knowledge Central, we dig into what’s really happening deep underground when the Earth moves, how scientists measure it, and why predicting the next big one is still so hard.

In this episode:

• Plate tectonics: the giant, slow-moving pieces of Earth’s crust
• Faults, and how built-up stress releases in a sudden snap
• The different types of seismic waves, and how they travel through the planet
• The Richter scale versus the moment magnitude scale, and what the numbers really mean
• The Ring of Fire, and why some places shake far more than others
• History’s biggest quakes, from the 1960 Chile earthquake to the 2004 Indian Ocean tsunami
• Why scientists still can’t predict earthquakes, and how early warning systems buy precious seconds

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For more than 1,500 years, a web of trade routes stretched from China to the Mediterranean, carrying silk, spices, horses and paper across deserts and mountains. It carried something even more powerful too: ideas. In this episode of Knowledge Central, we travel the Silk Road to see how it connected empires, spread religions and inventions, and helped build the world we live in today.

In this episode:

• How the Silk Road began under China’s Han dynasty, and why it wasn’t really one road
• The goods that moved along it, from silk and spices to paper, glass and gunpowder
• Caravans, oasis cities, and the merchants who kept trade moving
• How Buddhism, Islam, art and science spread along the routes
• Marco Polo, the Mongol Empire, and the Silk Road’s golden age
• The darker cargo: how the Black Death traveled west
• Why the old routes faded, and how the Silk Road’s name lives on today

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On January 28, 1986, millions of people, including schoolchildren across America, watched as the Space Shuttle Challenger lifted off from Florida. Seventy-three seconds later, it broke apart in the sky, killing all seven crew members, among them teacher Christa McAuliffe. In this episode of Knowledge Central, we look at how a small rubber seal, a freezing morning, and a series of ignored warnings led to one of the darkest days in the history of spaceflight.

In this episode:

• The mission, the crew, and why Christa McAuliffe’s flight was watched in classrooms nationwide
• The O-ring: how one part of a rocket booster failed in unusually cold weather
• The engineers who warned the launch wasn’t safe, and why they were overruled
• The Rogers Commission investigation, and Richard Feynman’s famous ice-water demonstration
• How Challenger changed NASA, and the lessons it still teaches about safety and decision-making

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At 1:23 in the morning on April 26, 1986, a safety test at the Chernobyl Nuclear Power Plant in Soviet Ukraine went catastrophically wrong. Reactor No. 4 exploded, releasing radiation across Europe and forcing the permanent evacuation of an entire city. In this episode of Knowledge Central, we look at what happened that night, why it happened, and how the world’s worst nuclear disaster still shapes the area today.

In this episode:

• The late-night safety test, and the reactor design flaw that turned it into a disaster
• The explosion, the fire, and the first responders who paid the highest price
• The evacuation of Pripyat, and the Soviet government’s delay in telling the world
• The cleanup by hundreds of thousands of “liquidators,” and the giant shelter built over the reactor
• The Exclusion Zone today: abandoned towns, returning wildlife, and radiation that will last for generations

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Why does February have 28 days? Why are there leap years? And why did people in 1752 go to bed on September 2nd and wake up on September 14th? In this episode of Knowledge Central, we explore how humans learned to track time using the moon, the sun and the stars, and the messy history behind the calendar hanging on your wall.

In this episode:

• Moon versus sun: lunar, solar, and lunisolar calendars
• How the ancient Egyptians built a 365-day year
• Julius Caesar’s calendar fix, and the invention of the leap year
• The Gregorian reform of 1582, and the days that vanished from history
• Why July and August are named after Roman rulers
• Calendars still in use around the world today, from the Islamic calendar to Chinese New Year

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On June 1, 2009, an Airbus A330 flying from Rio de Janeiro to Paris vanished over the Atlantic Ocean with 228 people on board. It took nearly two years to find the flight recorders on the ocean floor, and what they revealed changed how airline pilots are trained around the world. In this episode of Knowledge Central, we piece together what happened in the cockpit of Flight 447, and why a perfectly good airplane fell from the sky.

In this episode:

• The flight, the storm, and the moment the airspeed sensors iced over
• How the autopilot disconnected and handed a confusing situation to the crew
• The aerodynamic stall, and why the plane fell for more than three minutes
• The two-year deep-sea search for the wreckage and black boxes
• What investigators found, and the lessons that changed pilot training and automation

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