petrushkagoogol Posted February 22, 2016 Report Share Posted February 22, 2016 When someone cracks a good joke the whole fraternity expresses mirth. When someone yawns everyone in the vicinity does so too. When people march in unison there is an inherent spatial symmetry. Why is it that some activities are inherently predisposed to evoke a collective response ? Quote Link to comment Share on other sites More sharing options...
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