Shallow water on Europa, tourists making iguanas diabetic, dolphin social networking, working out how dinosaurs walked and what to do to save the world’s coral reefs.
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Ridges on the surface of an icy Jupiter moon could mean water – and life; Ecotourists could be giving rare tropical iguanas diabetes; Dolphins whistle at each other to keep in touch with distant friends; Walking in the footsteps of the biggest dinosaurs; Humans have ravaged the world’s coral reefs, but some are working to fix them.