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