The vagus nerve has become the internet’s favourite body part. On social media, it is everywhere. People hum into their phones, gargle with theatrical enthusiasm, dunk their faces into bowls of ice water and poke at their ears in the hope of “activating” it.So in this episode we focus our attention on the body’s longest cranial nerve and ask a simple question: what does the vagus nerve actually do, and can we really hack it?Hosts Katie Edwards and Dan Baumgardt turn this week to Arshad Majid, a professor of cerebrovascular neurology at the University of Sheffield and an expert in vagus nerve stimulation.Strange Health is a podcast from The Conversation is an independent, not-for-profit news organisation. Full credits for this episode available here. If you like the show, please consider donating to support our work. You can sign up here for a free daily newsletter from The Conversation here.Hosts: Katie Edwards from The Conversation and Dan Baumgardt, University of BristolExecutive Producer: Gemma WareEditing and mixing: Anouk MIlletArtwork: Alice MasonFrom decapitation to positive psychology: how one nerve connects body, brain and mindStimulating the pathway connecting body and brain may change chronic condition patients’ lives