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One scientist is correcting headlines on Twitter by adding one key two-word caveat – the fact that the research cited has only been carried out "in mice". Tim finds out more. And why is it that 4% of 75 is the same as 75% of 4? Professor Jennifer Rogers from the University of Oxford joins Tim in the studio to explore a mind-blowing maths ‘trick’. Presenter: Tim Harford Producer: Lizzy McNeill Photo: A mouse in hand / Credit: Getty images
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