Synopsis
George McGavin investigates the dramatic life of the oak tree, which wouldn't survive without its symbiotic relationship with a huge network of mycorrhizal fungi underground. The fungi transports nutrients from inaccessible places into the roots of the tree.

The Lungs (Full Programme) | Made of Stronger Stuff
Psychologist Kimberley Wilson and Dr Xand van Tulleken take a journey around the human body. In this episode it's the turn of the airbags, the lights… the lungs!

A circulatory path | Heart vs Mind: What makes us human
In the 17th century, Harvey discovered that blood flows in a circulatory path.