Hot tem­pers and hot weather — play­wrights sensed the con­nec­tion and made poetry of it. And it’s playing out again this week on our bloody streets.

For more than 100 years social sci­en­tists have researched and recorded it so that it is now almost a com­mon­place: aggres­sion and vio­lence increase as the tem­per­a­ture rises.

James Alan Fox, a pro­fessor of crim­i­nology at North­eastern Uni­ver­sity, col­lected data cor­re­lating daily tem­per­a­tures with vio­lent crime in Columbus, Ohio, in 2007. He showed there was more crime during the summer months and less as the weather cooled.

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