Psychologist Kimberley Wilson and Dr Xand van Tulleken take a journey around the human body, to find out what it can tell us about how we live in the world. In this episode, they find out there's much more to tears than meets the eye.

What is the purpose of tears, does crying actually make you feel better, and what happens when you lose your ability to make them at all?

Producer: Georgia Mills

A Whistledown production for BBC Radio 4