World's biggest whale heart and a high-jumping kangaroo rat

At the Royal Ontario Museum in Toronto, Canada, they've just completed their mission to preserve a blue whale heart - the largest heart of any animal in the world, weighing a whopping 200kg! It's something that had never been done before so Mark Engstrom, the Museum's Senior Curator, tells us exactly how they managed it.

We also discover the difference between carnivores and herbivores, our science expert Tom helps us out with an important question about Saturn, and we see how high a kangaroo rat can jump!

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