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More Or Less, presented by Tim Harford, hears how to use mathematics to find your life partner with Matt Parker, author of Things to Make and Do in the Fourth Dimension. And what are the chances that two friends, given the same due date for their babies’ birth, actually do give birth on the same day? Tim discusses the reliability - or otherwise - of pregnancy due dates with Professor Jason Gardosi of the Perinatal Institute in the UK.

Trending asks if politicians should have a thick skin when people abuse them online and reports on the reaction of the President of Ecuador. During his latest weekly presidential TV address, Rafael Correa, named and shamed people who had written abusive comments about him on Twitter and Facebook. Trending hears from some those who were the target of his ire. Also, Amhai, the mystery "donor", has given $100,000s to streamers - gamers who broadcast their playing on live stream sites such as Twitch. This week "he" started given money to French gamers. But who is Amhai and why were those French gamers advised to give their money back? Trending investigates.

In the Why Factor, Helena Merriman asks why we like sad music - according to a recent study, it has become increasingly popular. So what is going on in our brains and bodies when we listen to it? Japanese pianist and music researcher Dr Ai Kawakami explains some of the positive feelings and British composer Debbie Wiseman demonstrates what makes a piece of music sound sad.

(Photo: A couple sitting on a park bench. Credit: ÃÛÑ¿´«Ã½)