"Old muleskinners told how the mules were waiting at the shaft when they arrived each morning. They wanted relief from the heat, deerflies and mosquitoes just like the men."

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Do not Bodies and Light act mutually upon one another; that is to say, Bodies upon Light in emitting, reflecting, refracting and inflecting it, and Light upon Bodies for heating them, and putting their parts into a vibrating motion wherein heat consists?

— Isaac Newton