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One of us is a working dad who survived by learning a new set of skills, one of which was faecal analysis. Most elephants and other herbivores create "floaters" while most tigers and other carnivores create "sinkers" When parenthood hits, it hits hard. Unlike the ancients, we didn't believe that we could predict the future from children's stool. It's a surprisingly small range, given that elephant faeces have a volume of 20 litres, nearly a thousand times more than a dog's, at 10ml. Our defaecation data helped us design an adult nappy for astronauts The answer, we found, was in the properties of an ultra-thin layer of mucus lining the walls of the large intestine. As fluid dynamicists , we joined forces with colorectal surgeon Daniel Chu , and two stalwart undergraduates, Candice Kaminski and Morgan LaMarca, who filmed defaecation and hand-picked faeces from 34 mammalian species at Zoo Atlanta in order to measure their density and viscosity. It was something else, much more sinister.

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