John HealeySemaphore, South Australia Are humans the only animals that cry? If so, why?Ray Smith,Guyra, New South Wales, Australia Last Word is New Scientist’s long-running series in which readers give scientific answers to each other’s questions, ranging from the minutiae of everyday life to absurd astronomical hypotheticals. To answer a question or ask a new one, email [email protected] To answer this question – or ask a new one – email [email protected].
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