Instant Genius is a bite-sized masterclass in podcast form. And in this episode, we're drilling into the topic of Earth's mysterious centre.

Why? Well, a recent study carried out at Peking University has found that Earth’s inner core, a giant ball of iron located in the middle of the planet, is slowing down its rotation. But what exactly does this mean?

We speak to Dr Jessica Irving, a seismologist based at the University of Bristol’s School of Earth Sciences. She tells us how scientists study the goings on deep inside Earth, what we can learn about the life cycles of planets and whether the news should be cause for alarm.

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Jason Goodyer
Jason GoodyerCommissioning editor, BBC Science Focus

Jason is the commissioning editor for BBC Science Focus. He holds an MSc in physics and was named Section Editor of the Year by the British Society of Magazine Editors in 2019. He has been reporting on science and technology for more than a decade. During this time, he's walked the tunnels of the Large Hadron Collider, watched Stephen Hawking deliver his Reith Lecture on Black Holes and reported on everything from simulation universes to dancing cockatoos. He looks after the magazine’s and website’s news sections and makes regular appearances on the Instant Genius Podcast.