Dr Chris Smith and the Naked Scientist team present the latest science news, analysis and breakthroughs. This week: could lab-grown mini-guts help us to crack the problem of Crohn's disease? Is the universe organised like a bagel? And how did a 115 year old cricketing contraption bowl out an Australian cricket legend? Plus an in-depth look into what causes gambling addiction, and how can we help to treat it. If you’ve been affected by addiction, and for support on topics within this programme, you can get details of organisations within the UK by visiting the BBC Actionline website: https://bbc.co.uk/actionline