Demography also includes the study of non-living objects like light bulbs and taxi cabs and buildings because these are also populations.
人口统计学还包括对非生物物体的研究，如灯泡、出租车和建筑物，因为这些也属于种群。
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To find out if this extends to non-living beings, Laleh Quinn at the University of California, San Diego, and her colleagues tested whether rats can detect social signals from robotic rats.