Welcome to What’s Up Docs?, the podcast where doctors and identical twins Chris and Xand van Tulleken cut through the confusion around health and wellbeing.

In this episode, the Doctors turn their attention to laughter. You’ve probably heard the phrase 'laughter is the best medicine', but have you ever wondered if there’s actually any science behind that? Can a good belly laugh really help with stress, pain, or even your immune system? How does it help to improve our relationships? And why do we laugh at all - even when nothing’s particularly funny?

To find out, Chris and Xand sit down with Professor Sophie Scott CBE, a leading expert in the neuroscience of laughter from University College London.

If you want to get in touch, you can email us at whatsupdocs@bbc.co.uk or WhatsApp us on 08000 665 123.

Presenters: Drs Chris and Xand van Tulleken Guest: Professor Sophie Scott Producer: Jo Rowntree Executive Producer: Rami Tzabar Editor: Kirsten Lass Assistant Producer: Maia Miller-Lewis Researcher: Grace Revill Tech Lead: Reuben Huxtable Social Media: Leon Gower Digital Lead: Richard Berry Composer: Phoebe McFarlane Sound Design: Melvin Rickarby At the BBC: Assistant Commissioner: Greg Smith Commissioning Editor: Rhian Roberts A Loftus Media production for BBC Radio 4

Why Do Languages Have Contractions?