S1E88 - Dying In Space, Trapped Water, and What's Hidden In Pi?

Almost every human who has ever lived has one thing in common: they were born and died on Earth. Except for three people.

Hannah Fry and Michael Stevens uncover the extraordinary story of Soyuz 11, the Soviet cosmonauts who became the only humans ever to die in outer space, and what their deaths meant for the future of human spaceflight.
But that raises a bigger question: what exactly is trapped on Earth, and what can escape?

Is the water left inside discarded plastic bottles being locked away forever? Is Earth itself slowly leaking...