This week in science news, we find out about hippopotamuses' gut biomes, fish kills, the creative sleep phase, and water freezing. Then, Professor David Bishop from Victoria University talks about new research into the relationship between exercise and mitochondria; Dr Larissa Nicholls from Monash University talks about new tailored approaches to domestic energy usage; and Chris KP links the value and roles of experts, cognitive biases and geological time. With presenters Dr. Shane, Chris KP, Dr. Jen, and Professor Euan. 

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