Extras

    Video thumbnail: Breakthrough: The Ideas That Changed the World The Ultimate Rocket Fuel

    Breakthrough: The Ideas That Changed the World

    The Ultimate Rocket Fuel

    Jim Al-Khalili demonstrates why hydrogen is the ultimate rocket fuel.

    The Ultimate Rocket Fuel

    Video thumbnail: Breakthrough: The Ideas That Changed the World Episode 5 Preview | The Rocket

    Breakthrough: The Ideas That Changed the World

    Episode 5 Preview | The Rocket

    Blast off into history to see how rockets originated not in the sky, but in a cave.

    Episode 5 Preview | The Rocket

    Video thumbnail: Breakthrough: The Ideas That Changed the World The Rocket Equation

    Breakthrough: The Ideas That Changed the World

    The Rocket Equation

    Franklin Chang-Diaz demonstrates the energy required to launch a rocket into space.

    The Rocket Equation