What researchers found by studying the microbiome of the world's oldest known person - and the other researcher went to some icky places to understand the behaviour of her two cats, Mildred and Merle.

Science: Gut biome, music + reading, why cats eat grass

Smart, in-depth and relentlessly curious, host Kathryn Ryan dives into the stories shaping New Zealand and its people. Interviews and expert analysis from around the world and at home. It’s where big ideas are unpacked and everyday life explored.

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Science: Gut biome, music + reading, why cats eat grass

Science: Gut biome, music + reading, why cats eat grass