Madeleine Finlay and co-host Ian Sample discuss the three science stories you need to know about this week, including an alternative to BMI for diagnosing obesity which could ‘prevent misdiagnosis for millions’. Also on the agenda: an update from this year’s Cop climate conference in Turkey, and a study that claims to have found the key to better conversations with the help of a concept from physics

Follow the Guardian’s coverage of Cop31

Want to have a better chat? Scientists say the secret is ‘pink noise’

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