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Artificial faeces, with all the key ingredients apart from the harmful pathogens, is useful for testing natural sewage treatment in areas where unsanitary conditions can lead to 750,000 child deaths across the globe every year. In a strange cookery lesson from the University of Bath, UK, civil engineering postgraduate Naomi Deering gives the recipe for fake poo. (Image: Naomi Deering creating artificial poo, Credit: University of Bath.)